Summary: SD card not working on your Mac? Mac won't read SD card? macOS Catalina is not recognizing SD card? In this article, we will help fix Mac not reading or recognizing SD card issue.
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Accidents happen at any time (For example: When I insert SD card nothing happens on Mac). When your SD card is not working properly, you can't open and access the files stored the SD card.
As you see SD card is not readable by your Mac, those are possible questions in your mind. Why is Mac not reading SD card and SD card not working? How do I get my Mac to recognize my SD card? How to do SD card data recovery?
This passage is a complete SD card troubleshooting guide to fix SD card not working, reading or recognized issue.
- Table of contents
- 1. How to fix Mac not reading or recognizing SD card?
- 2. Understanding why SD card not reading or recognized on Mac
- 3. How to prevent 'SD card not reading or recognized' in future?
- 4. How to use and open SD card on Mac?
How to fix SD card not showing up or reading on Mac?
As below, we have listed some feasible solutions to fix SD card not working or reading on Mac:
Option 1: Check your Finder desktop and sidebar preferences
On Mac, you can choose to show connected items on the desktop, including hard disks, external disks, connected servers. Therefore, if you don't set the preference to show your SD card on the desktop, it won't appear on Mac. Easy to understand, huh? Let's see how to show SD card on the desktop?
Step 1: Go to Finder > Preferences > General, make sure the 'External disks' option is ticked. This will make the SD card show up on the Desktop.
Step 2: Select the Sidebar tab on the top, make sure the External disks option under Locations is also ticked.
Option 2: Restart your Mac
Whether the issue is related to networking, graphics, slow performance, faulty programs or macOS issue, a simple reboot can fix a computer issue 80-90% of the time. It also works when external drives are not recognized by macOS.
When your SD card is not reading on Mac, you can try to remove the SD card and then switch off the Mac. Leave it for a few minutes, turn it back on, and try again.
Option 3: Check if SD card reader is not working
To access an SD card, you usually need a card reader. When your SD card won't work on Mac, the first thing to check is whether the card reader is working or not. It doesn't matter that you access the SD card by the built-in slot on your Mac or a third-party one. Aqua machineries pvt ltd careers. Simply follow these steps to check if the SD card reader is recognized or not.
Step 1: Simply click Apple Menu > About This Mac > System Report.
Step 2: Find Card Reader under the Hardware list.
Step 3: If the card reader works, you can see its Vendor ID, Serial Number, and some other product information. When your SD card is inserted, it should also be listed at the right with specifications.
If unfortunately, the card reader is not recognized, it might be an SD card hardware issue. For a broken slot built-in your MacBook, you need to send it to a local Apple store for repair service. Instead, for a malfunctioned external SD card reader, you can simply replace it with a new one.
• How to fix SD card reader not working on Mac?
Option 4: Check for the connection issue
If the card reader is working fine, then you should check the connections. First of all, make sure you insert your SD card properly. (The metal contacts must face down and point toward your Mac). Secondly, you can test your SD card on a different card reader. If you can access the SD card then, it should be the card reader that has a problem.
Option 5: Check if SD card is locked
Another case for SD card not working on Mac is that the SD card is write protected. When you try to write content to the locked SD card, you cannot modify the files on the locked SD card. To work on the SD card again, you need to safely eject the SD card and adjust the lock slider tab on the card to unlock the card. Then you can access the SD card after you reinsert it to the slot.
Option 6: Insert your SD card in different devices
Another very effective strategy that you can implement is to insert the SD card in different devices, such as phones, digital cameras, or other computers. For instance, you can remove the SD card from your Mac and insert it into your Android phone. If your SD card is still not detected or working on a phone, the card might be damaged or you need to try the following solutions.
Option 7: Reset NVRAM/PRAM
NVRAM/PRAM is a chip in Intel-based Macs used to remember the setting for your computer, including sound volume, display resolution, startup disk selection, time zone, peripheral devices and more. It's worth resetting whenever you find your computer's hardware acting in unexpected ways.
To reset NVRAM, you should shut down your Mac, then turn it on and immediately press and hold Option + Command + P + R. Keep holding down those keys for about 20 seconds. Then release the keys and allow your Mac to continue starting normally.
Option 8: Mount SD card in Disk Utility
After resetting NVRAM/PRAM, your SD card is still not recognized on Mac. You should go to Disk Utility again and see whether the SD card is listed. If you can see your SD card in Disk Utility, but the SD card is greyed out, that means the SD card is not mounting. Simply select the Mount option to see if the SD card will be mounted in Finder and desktop.
Option 9: Update the drivers on Mac
If the issue still exists, you can check whether the drivers on your Mac is renewed. If your Mac drivers are outdated, your SD card or other external hard drives will not be recognized by your Mac. Here are steps to update drives on Mac:
1. If you have upgraded to macOS Mojave, you should choose System Preferences from the Apple menu, then click Software Update to check for updates. If any updates are available, click Update Now to install them.
2. If you are using earlier macOS versions, just launch the Mac App Store, click the Update tab on the top and then choose the 'Update All'.
Option 10: Repair SD card via First Aid
Still, have no luck to get your Mac to read the SD card? The SD card may be corrupted and needs to be repaired. All portable hard drives have a limited life span, as wear and tear could bring bad sectors on the disk. Thankfully, macOS has a built-in repair tool - First Aid, which allows you to fix SD card errors on Mac.
Step 1: Go to Applications > Utilities > Disk Utility.
Step 2: Select the corrupted SD card and click 'First Aid' on the top.
Step 3: Wait until the reparation process finished.
Option 11: Format your SD card
If unfortunately, you receive the error message: 'Disk Utility can't repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files', the file system of your SD card is seriously damaged and you need to reformat it.
Step 1: Recover data from SD card.
Reformatting will erase all data on the SD card, so please recover important data from SD card first.
• How to recover data from SD card on Mac?
Step 2: Format your SD card with Disk Utility.
• How to format an SD card on Mac?
Option 12: Send SD card to an expert for reparation
If your SD card can't be seen in Disk Utility at all after trying all above methods, it means the SD card has some hardware problem so that Mac can't detect it. In this situation, you have no choice but to send the SD card to an expert for reparation.
Option 13: Replace SD card with a new one
If the warranty of your SD card is still valid, it's most likely time to invest in a replacement or ask for a refund.
Understanding why SD card not showing up or reading on Mac
However, there are times when you insert SD card into Mac, the SD card won't show up on Mac. Or what's worse, SD card won't work on your Mac. You must have experienced a similar situation. Don't be panicked, as you are not the only person, many Mac users have encountered this problem:
I connected my SD card to transfer some necessary files and folders, but my card is not recognized by MacBook Pro. I thought to check my card properly and I connected that SD card to my friend's machine but again card didn't get recognized on his Mac machine. Maybe there is a problem with my SD card? Any solution to resolve the issue?
Wondering why the SD card is not recognized by Mac? Go on, please.
SD cards are prone to be damaged. Here are 7 common reasons why an SD card isn't working on Mac.
- USB port is not working or damaged.
- SD card reader is not working.
- SD card is formatted incorrectly (the file system is not compatible with macOS)
- SD card driver is outdated.
- SD card is logically corrupted.
- There are bad sectors in the SD card.
- SD card is physically damaged.
In a word, you'll need to determine whether your SD card's error is due to a logical problem or a physical one. For the former, you can try to fix it by yourself, otherwise, you have to ask for help from a trained expert.
How to prevent 'SD card not showing up or reading on Mac' in future?
SD cards are easy to be damaged, but using them in the right way, corruption can be avoided to some extent. Read on for 7 effective tips to prevent 'SD card not working':
- Format the new SD card as soon as you get it. When you buy an SD card, you should format it on the device and make sure it is compatible with the device system.
- Always safely eject SD card from the device. On Mac, click on the Finder icon on the Dock. Locate the SD card from the left sidebar and click on the Eject icon next to the name of the SD card. As an alternative, you can drag the device to the Trash on the desktop to eject it. More specifically, you should avoid removing the SD card from the device when it is still accessed, such as transferring data or reading data, etc.
- Keep some space left on the SD card. Keep in mind that you should never run out of the space of your SD card.
- Turn off the device before removing the SD card. If you want to remove your SD card from a digital camera or mobile phone, you should ensure the device is entirely turned off. Otherwise, the SD card can easily be corrupted.
- Properly store your SD card in a safe place. Store the SD card in dry, cool space since dirt, moisture, and other factors could damage them.
- Stop using the SD card when getting any errors. As soon as you receive any errors when trying to access the SD card, such as 'the disk you inserted is not readable by this computer', you'd better stop all operations at once in case further damage will be made to the SD card.
- Install antivirus software and run it regularly. It's important to scan an SD card for viruses and running antivirus software to remove any malware on your computer. In this way, you can prevent malware and virus from damaging your SD card.
How to use and open SD card on Mac?
Apple dropped the SD card slot in MacBook Pro starting with 2016 model. While MacBook Air 2015 and later MacBook never included an SD slot.
If your Mac comes with a built-in SD card slot, you can insert a compatible SD card, avoiding using SD card that has a thickness greater than 2.1mm.
When inserting SD card, you should make sure that the metal contacts face down and point toward the computer. Then your computer will recognize SD card inserted into the card slot as a storage device. You can read and write to SD card just like any other external drive.
• How to fix Mac not recognizing external drives issue?
But if your Mac doesn't have an SD card slot, you need to buy an SD card adapter. Insert the micro SD card into the slot face up with the gold pins going first.
How to open an SD card on Mac?
Step 1: Open SD card in Finder.
Click the Finder app, you will see your SD card listed in the left pane and then view the contents of the SD card in the right pane.
Step 2: Safely eject SD card.
After you finish your work on the SD card, you can remove it properly. But before that, you need to make sure that all data transfer to SD media is completed. Then the SD card will work correctly next time. To eject the card, drag its icon on the desktop to the Trash. After the icon disappears from your desktop, you are safe to remove the card from the slot.
You should avoid removing an SD card while your Mac is sleeping. It could lead to data loss. Always wake your computer, save your work, and then safely eject the SD card.
Conclusion
How to deal with SD card not working or recognized on Mac? No matter what causes this problem, there are lots of potential solutions. You can begin by checking the connection and then try to repair the corrupted SD card. If your SD card is still not recognized by Mac, you should format the SD card on Mac to see if this fixes your issue.
Smart Card Reader Driver For Mac
If you experience any data loss issue during this process, the good news is that your data can still be recovered with iBoysoft Data Recovery for Mac. This free Mac data recovery tool can recover deleted/lost photos from SD card quickly and easily.
Should you have another suggestion to fix SD card not working or detected issue on Mac? Or have any questions when you are using iBoysoft Data Recovery for Mac? Please feel free to contact us by sending an email.
NOTE:
Between mid October 2019 and mid February 2020 everyone in the Army was migrated to use their PIV Authentication certificate for Email access. You no longer use the Email certificate for Enterprise Email or any CAC enabled websites
Mac users who choose to upgrade (or already have upgraded) to Mac OS Catalina (10.15.x) will need to uninstall all 3rd Party CAC enablers per https://militarycac.com/macuninstall.htm AND reenable the built in smart card ability (very bottom of macuninstall link above)
If you purchased your Mac with OS Catalina (10.15.x) already installed, you can skip the uninstall part above and follow the instructions below.
6 'high level' steps needed, follow down the page to make this a painless systematic process
| 1. | Is your CAC reader 'Mac friendly'? |
| 2. | Can your Mac 'see' the reader? |
| 3. | Verify which version of Mac OS you have |
| 4. | Figure out which CAC (ID card) you have |
| 5. | Install the DoD certificates |
| 5a. | Additional DoD certificate installation instructions for Firefox users |
| 6. | Decide which CAC enabler you want to use (except for 10.12-.15) |
Step 1: Is your CAC reader Mac friendly?
Visit the USB Readers page to verify the CAC reader you have is Mac friendly.
Visit the USB-C Readers page to verify the CAC reader you have is Mac friendly.
'Some, not all' CAC readers may need to have a driver installed to make it work.
NOTE: Readers such as: SCR-331 & SCR-3500A may need a firmware update (NO OTHER Readers need firmware updates).
Information about these specific readers are in Step 2
Step 2: Can your Mac 'see' the reader?
Plug the CAC reader into an open USB port before proceeding, give it a few moments to install
Step 2a: Click the Apple Icon in the upper left corner of the desktop, select 'About This Mac'
Step 2b: Click 'System Report..' (button)
Step 2c: Verify the CAC reader shows in Hardware, USB, under USB Device Tree. Different readers will show differently, most readers have no problem in this step. See Step 2c1 for specific reader issues.
Step 2c1: Verify firmware version on your SCR-331 or GSR-202, 202V, 203 CAC, or SCR-3500a reader. If you have a reader other than these 5, Proceed directly to step 3
Step 2c1a-SCR-331 reader
If your reader does not look like this, go to the next step.
In the 'Hardware' drop down, click 'USB.' On the right side of the screen under 'USB Device Tree' the window will display all hardware plugged into the USB ports on your Mac. Look for 'SCRx31 USB Smart Card Reader.' If the Smart Card reader is present, look at 'Version' in the lower right corner of this box: If you have a number below 5.25, you need to update your firmware to 5.25. If you are already at 5.25, your reader is installed on your system, and no further hardware changes are required. You can now Quit System Profiler and continue to Step 3.
Step 2c1b-SCR-3500A reader
If you have the SCR3500A P/N:905430-1 CAC reader,you may need to install this driver, as the one that installs automatically will not work on most Macs. Hold the control key [on your keyboard] when clicking the .pkg file [with your mouse], select [the word] Open
Step 3: Verify which version of MacOS do you have?
(You need to know this information for step 6)
Step 3a: Click the Apple Icon in the upper left corner of your desktop and select 'About This Mac'
Step 3b: Look below Mac OS X for: Example: Version 10.X.X.
Step 4: Figure out which CAC (ID Card) you have
(You need to know this information for step 6)
Look at the top back of your ID card for these card types. If you have any version other than the six shown below, you need to visit an ID card office and have it replaced. All CACs [other than these six] were supposed to be replaced prior to 1 October 2012.
Find out how to flip card over video
Step 5: Install the DoD certificates (for Safari and Chrome Users)
Go to Keychain Access
Click: Go (top of screen), Utilities, double click Keychain Access.app
(You can also type: keychain access using Spotlight (this is my preferred method))
Select login (under Keychains),and All Items (under Category).
Download the 5 files via links below (you may need to click, select Download Linked File As.. on each link) Save to your downloads folder
Please know.. IF You have any DoD certificates already located in your keychain access, you will need to delete them prior to running the AllCerts.p7b file below.
https://militarycac.com/maccerts/AllCerts.p7b,
https://militarycac.com/maccerts/RootCert2.cer,
https://militarycac.com/maccerts/RootCert3.cer,
https://militarycac.com/maccerts/RootCert4.cer, and
Macbook Not Reading Sd Card
Double click each of the files to install certificates into the login section of keychain
Select the Kind column, verify the arrow is pointing up, scroll down to certificate, look for all of the following certificates:
DOD EMAIL CA-33 through DOD EMAIL CA-34,
DOD EMAIL CA-39 through DOD EMAIL CA-44,
DOD EMAIL CA-49 through DOD EMAIL CA-52,
DOD EMAIL CA-59,
DOD ID CA-33 through DOD ID CA-34,
DOD ID CA-39 through DOD ID CA-44,
DOD ID CA-49 through DOD ID CA-52,
DOD ID CA-59
DOD ID SW CA-35 through DOD ID SW CA-38,
DOD ID SW CA-45 through DOD ID SW CA-48,
DoD Root CA 2 through DoD Root CA 5,
DOD SW CA-53 through DOD SW CA-58, and
DOD SW CA-60 through DOD SW CA-61
NOTE: If you are missing any of the above certificates, you have 2 choices,
1. Delete all of them, and re-run the 5 files above, or
2. Download the allcerts.zip file and install each of the certificates you are missing individually.
Errors:
Error 100001 Solution
Error 100013 Solution
You may notice some of the certificates will have a red circle with a white X . This means your computer does not trust those certificates
You need to manually trust the DoD Root CA 2, 3, 4, & 5 certificates
Double click each of the DoD Root CA certificates, select the triangle next to Trust, in the When using this certificate: select Always Trust, repeat until all 4 do not have the red circle with a white X.
You may be prompted to enter computer password when you close the window
Once you select Always Trust, your icon will have a light blue circle with a white + on it.
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The 'bad certs' that have caused problems for Windows users may show up in the keychain access section on some Macs. These need to be deleted / moved to trash.
The DoD Root CA 2 & 3 you are removing has a light blue frame, leave the yellow frame version. The icons may or may not have a red circle with the white x
| or | DoD Interoperability Root CA 1 or CA 2 | certificate | |
| DoD Root CA 2 or 3 (light blue frame ONLY) | certificate | ||
| or | Federal Bridge CA 2016 or 2013 | certificate | |
| or | Federal Common Policy CA | certificate | |
| or | or | SHA-1 Federal Root CA G2 | certificate |
| or | US DoD CCEB Interoperability Root CA 1 | certificate |
If you have tried accessing CAC enabled sites prior to following these instructions, please go through this page before proceeding
Clearing the keychain (opens a new page)
Please come back to this page to continue installation instructions.
Step 5a: DoD certificate installation instructions for Firefox users
NOTE: Firefox will not work on Catalina (10.15.x), or last 4 versions of Mac OS if using the native Apple smartcard ability
Download AllCerts.zip, [remember where you save it].
double click the allcerts.zip file (it'll automatically extract into a new folder)
Option 1 to install the certificates (semi automated):
From inside the AllCerts extracted folder, select all of the certificates
click (or Right click) the selected certificates, select Open With, Other..
In the Enable (selection box), change to All Applications
Select Firefox, then Open
You will see several dozen browser tabs open up, let it open as many as it wants.
You will eventually start seeing either of the 2 messages shown next
If the certificate is not already in Firefox, a window will pop up stating 'You have been asked to trust a new Certificate Authority (CA).'
Check all three boxes to allow the certificate to: identify websites, identify email users, and identify software developers
or
'Alert This certificate is already installed as a certificate authority.' Click OK
Smart Card Reader Driver Mac
Once you've added all of the certificates..
• Click Firefox (word) (upper left of your screen)
• Preferences
• Advanced (tab)
• Press Network under the Advanced Tab
• In the Cached Web Content section, click Clear Now (button).
• Quit Firefox and restart it
Option 2 to install the certificates (very tedious manual):
Click Firefox (word) (upper left of your screen)
Preferences
Advanced (tab on left side of screen)
Certificates (tab)
View Certificates (button)
Authorities (tab)
Import (button)
Browse to the DoD certificates (AllCerts) extracted folder you downloaded and extracted above.
Note: You have to do this step for every single certificate
Note2: If the certificate is already in Firefox, a window will pop up stating: 'Alert This certificate is already installed as a certificate authority (CA).' Click OK
Step 1: Simply click Apple Menu > About This Mac > System Report.
Step 2: Find Card Reader under the Hardware list.
Step 3: If the card reader works, you can see its Vendor ID, Serial Number, and some other product information. When your SD card is inserted, it should also be listed at the right with specifications.
If unfortunately, the card reader is not recognized, it might be an SD card hardware issue. For a broken slot built-in your MacBook, you need to send it to a local Apple store for repair service. Instead, for a malfunctioned external SD card reader, you can simply replace it with a new one.
• How to fix SD card reader not working on Mac?
Option 4: Check for the connection issue
If the card reader is working fine, then you should check the connections. First of all, make sure you insert your SD card properly. (The metal contacts must face down and point toward your Mac). Secondly, you can test your SD card on a different card reader. If you can access the SD card then, it should be the card reader that has a problem.
Option 5: Check if SD card is locked
Another case for SD card not working on Mac is that the SD card is write protected. When you try to write content to the locked SD card, you cannot modify the files on the locked SD card. To work on the SD card again, you need to safely eject the SD card and adjust the lock slider tab on the card to unlock the card. Then you can access the SD card after you reinsert it to the slot.
Option 6: Insert your SD card in different devices
Another very effective strategy that you can implement is to insert the SD card in different devices, such as phones, digital cameras, or other computers. For instance, you can remove the SD card from your Mac and insert it into your Android phone. If your SD card is still not detected or working on a phone, the card might be damaged or you need to try the following solutions.
Option 7: Reset NVRAM/PRAM
NVRAM/PRAM is a chip in Intel-based Macs used to remember the setting for your computer, including sound volume, display resolution, startup disk selection, time zone, peripheral devices and more. It's worth resetting whenever you find your computer's hardware acting in unexpected ways.
To reset NVRAM, you should shut down your Mac, then turn it on and immediately press and hold Option + Command + P + R. Keep holding down those keys for about 20 seconds. Then release the keys and allow your Mac to continue starting normally.
Option 8: Mount SD card in Disk Utility
After resetting NVRAM/PRAM, your SD card is still not recognized on Mac. You should go to Disk Utility again and see whether the SD card is listed. If you can see your SD card in Disk Utility, but the SD card is greyed out, that means the SD card is not mounting. Simply select the Mount option to see if the SD card will be mounted in Finder and desktop.
Option 9: Update the drivers on Mac
If the issue still exists, you can check whether the drivers on your Mac is renewed. If your Mac drivers are outdated, your SD card or other external hard drives will not be recognized by your Mac. Here are steps to update drives on Mac:
1. If you have upgraded to macOS Mojave, you should choose System Preferences from the Apple menu, then click Software Update to check for updates. If any updates are available, click Update Now to install them.
2. If you are using earlier macOS versions, just launch the Mac App Store, click the Update tab on the top and then choose the 'Update All'.
Option 10: Repair SD card via First Aid
Still, have no luck to get your Mac to read the SD card? The SD card may be corrupted and needs to be repaired. All portable hard drives have a limited life span, as wear and tear could bring bad sectors on the disk. Thankfully, macOS has a built-in repair tool - First Aid, which allows you to fix SD card errors on Mac.
Step 1: Go to Applications > Utilities > Disk Utility.
Step 2: Select the corrupted SD card and click 'First Aid' on the top.
Step 3: Wait until the reparation process finished.
Option 11: Format your SD card
If unfortunately, you receive the error message: 'Disk Utility can't repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files', the file system of your SD card is seriously damaged and you need to reformat it.
Step 1: Recover data from SD card.
Reformatting will erase all data on the SD card, so please recover important data from SD card first.
• How to recover data from SD card on Mac?
Step 2: Format your SD card with Disk Utility.
• How to format an SD card on Mac?
Option 12: Send SD card to an expert for reparation
If your SD card can't be seen in Disk Utility at all after trying all above methods, it means the SD card has some hardware problem so that Mac can't detect it. In this situation, you have no choice but to send the SD card to an expert for reparation.
Option 13: Replace SD card with a new one
If the warranty of your SD card is still valid, it's most likely time to invest in a replacement or ask for a refund.
Understanding why SD card not showing up or reading on Mac
However, there are times when you insert SD card into Mac, the SD card won't show up on Mac. Or what's worse, SD card won't work on your Mac. You must have experienced a similar situation. Don't be panicked, as you are not the only person, many Mac users have encountered this problem:
I connected my SD card to transfer some necessary files and folders, but my card is not recognized by MacBook Pro. I thought to check my card properly and I connected that SD card to my friend's machine but again card didn't get recognized on his Mac machine. Maybe there is a problem with my SD card? Any solution to resolve the issue?
Wondering why the SD card is not recognized by Mac? Go on, please.
SD cards are prone to be damaged. Here are 7 common reasons why an SD card isn't working on Mac.
- USB port is not working or damaged.
- SD card reader is not working.
- SD card is formatted incorrectly (the file system is not compatible with macOS)
- SD card driver is outdated.
- SD card is logically corrupted.
- There are bad sectors in the SD card.
- SD card is physically damaged.
In a word, you'll need to determine whether your SD card's error is due to a logical problem or a physical one. For the former, you can try to fix it by yourself, otherwise, you have to ask for help from a trained expert.
How to prevent 'SD card not showing up or reading on Mac' in future?
SD cards are easy to be damaged, but using them in the right way, corruption can be avoided to some extent. Read on for 7 effective tips to prevent 'SD card not working':
- Format the new SD card as soon as you get it. When you buy an SD card, you should format it on the device and make sure it is compatible with the device system.
- Always safely eject SD card from the device. On Mac, click on the Finder icon on the Dock. Locate the SD card from the left sidebar and click on the Eject icon next to the name of the SD card. As an alternative, you can drag the device to the Trash on the desktop to eject it. More specifically, you should avoid removing the SD card from the device when it is still accessed, such as transferring data or reading data, etc.
- Keep some space left on the SD card. Keep in mind that you should never run out of the space of your SD card.
- Turn off the device before removing the SD card. If you want to remove your SD card from a digital camera or mobile phone, you should ensure the device is entirely turned off. Otherwise, the SD card can easily be corrupted.
- Properly store your SD card in a safe place. Store the SD card in dry, cool space since dirt, moisture, and other factors could damage them.
- Stop using the SD card when getting any errors. As soon as you receive any errors when trying to access the SD card, such as 'the disk you inserted is not readable by this computer', you'd better stop all operations at once in case further damage will be made to the SD card.
- Install antivirus software and run it regularly. It's important to scan an SD card for viruses and running antivirus software to remove any malware on your computer. In this way, you can prevent malware and virus from damaging your SD card.
How to use and open SD card on Mac?
Apple dropped the SD card slot in MacBook Pro starting with 2016 model. While MacBook Air 2015 and later MacBook never included an SD slot.
If your Mac comes with a built-in SD card slot, you can insert a compatible SD card, avoiding using SD card that has a thickness greater than 2.1mm.
When inserting SD card, you should make sure that the metal contacts face down and point toward the computer. Then your computer will recognize SD card inserted into the card slot as a storage device. You can read and write to SD card just like any other external drive.
• How to fix Mac not recognizing external drives issue?
But if your Mac doesn't have an SD card slot, you need to buy an SD card adapter. Insert the micro SD card into the slot face up with the gold pins going first.
How to open an SD card on Mac?
Step 1: Open SD card in Finder.
Click the Finder app, you will see your SD card listed in the left pane and then view the contents of the SD card in the right pane.
Step 2: Safely eject SD card.
After you finish your work on the SD card, you can remove it properly. But before that, you need to make sure that all data transfer to SD media is completed. Then the SD card will work correctly next time. To eject the card, drag its icon on the desktop to the Trash. After the icon disappears from your desktop, you are safe to remove the card from the slot.
You should avoid removing an SD card while your Mac is sleeping. It could lead to data loss. Always wake your computer, save your work, and then safely eject the SD card.
Conclusion
How to deal with SD card not working or recognized on Mac? No matter what causes this problem, there are lots of potential solutions. You can begin by checking the connection and then try to repair the corrupted SD card. If your SD card is still not recognized by Mac, you should format the SD card on Mac to see if this fixes your issue.
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If you experience any data loss issue during this process, the good news is that your data can still be recovered with iBoysoft Data Recovery for Mac. This free Mac data recovery tool can recover deleted/lost photos from SD card quickly and easily.
Should you have another suggestion to fix SD card not working or detected issue on Mac? Or have any questions when you are using iBoysoft Data Recovery for Mac? Please feel free to contact us by sending an email.
NOTE:
Between mid October 2019 and mid February 2020 everyone in the Army was migrated to use their PIV Authentication certificate for Email access. You no longer use the Email certificate for Enterprise Email or any CAC enabled websites
Mac users who choose to upgrade (or already have upgraded) to Mac OS Catalina (10.15.x) will need to uninstall all 3rd Party CAC enablers per https://militarycac.com/macuninstall.htm AND reenable the built in smart card ability (very bottom of macuninstall link above)
If you purchased your Mac with OS Catalina (10.15.x) already installed, you can skip the uninstall part above and follow the instructions below.
6 'high level' steps needed, follow down the page to make this a painless systematic process
| 1. | Is your CAC reader 'Mac friendly'? |
| 2. | Can your Mac 'see' the reader? |
| 3. | Verify which version of Mac OS you have |
| 4. | Figure out which CAC (ID card) you have |
| 5. | Install the DoD certificates |
| 5a. | Additional DoD certificate installation instructions for Firefox users |
| 6. | Decide which CAC enabler you want to use (except for 10.12-.15) |
Step 1: Is your CAC reader Mac friendly?
Visit the USB Readers page to verify the CAC reader you have is Mac friendly.
Visit the USB-C Readers page to verify the CAC reader you have is Mac friendly.
'Some, not all' CAC readers may need to have a driver installed to make it work.
NOTE: Readers such as: SCR-331 & SCR-3500A may need a firmware update (NO OTHER Readers need firmware updates).
Information about these specific readers are in Step 2
Step 2: Can your Mac 'see' the reader?
Plug the CAC reader into an open USB port before proceeding, give it a few moments to install
Step 2a: Click the Apple Icon in the upper left corner of the desktop, select 'About This Mac'
Step 2b: Click 'System Report..' (button)
Step 2c: Verify the CAC reader shows in Hardware, USB, under USB Device Tree. Different readers will show differently, most readers have no problem in this step. See Step 2c1 for specific reader issues.
Step 2c1: Verify firmware version on your SCR-331 or GSR-202, 202V, 203 CAC, or SCR-3500a reader. If you have a reader other than these 5, Proceed directly to step 3
Step 2c1a-SCR-331 reader
If your reader does not look like this, go to the next step.
In the 'Hardware' drop down, click 'USB.' On the right side of the screen under 'USB Device Tree' the window will display all hardware plugged into the USB ports on your Mac. Look for 'SCRx31 USB Smart Card Reader.' If the Smart Card reader is present, look at 'Version' in the lower right corner of this box: If you have a number below 5.25, you need to update your firmware to 5.25. If you are already at 5.25, your reader is installed on your system, and no further hardware changes are required. You can now Quit System Profiler and continue to Step 3.
Step 2c1b-SCR-3500A reader
If you have the SCR3500A P/N:905430-1 CAC reader,you may need to install this driver, as the one that installs automatically will not work on most Macs. Hold the control key [on your keyboard] when clicking the .pkg file [with your mouse], select [the word] Open
Step 3: Verify which version of MacOS do you have?
(You need to know this information for step 6)
Step 3a: Click the Apple Icon in the upper left corner of your desktop and select 'About This Mac'
Step 3b: Look below Mac OS X for: Example: Version 10.X.X.
Step 4: Figure out which CAC (ID Card) you have
(You need to know this information for step 6)
Look at the top back of your ID card for these card types. If you have any version other than the six shown below, you need to visit an ID card office and have it replaced. All CACs [other than these six] were supposed to be replaced prior to 1 October 2012.
Find out how to flip card over video
Step 5: Install the DoD certificates (for Safari and Chrome Users)
Go to Keychain Access
Click: Go (top of screen), Utilities, double click Keychain Access.app
(You can also type: keychain access using Spotlight (this is my preferred method))
Select login (under Keychains),and All Items (under Category).
Download the 5 files via links below (you may need to click, select Download Linked File As.. on each link) Save to your downloads folder
Please know.. IF You have any DoD certificates already located in your keychain access, you will need to delete them prior to running the AllCerts.p7b file below.
https://militarycac.com/maccerts/AllCerts.p7b,
https://militarycac.com/maccerts/RootCert2.cer,
https://militarycac.com/maccerts/RootCert3.cer,
https://militarycac.com/maccerts/RootCert4.cer, and
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Double click each of the files to install certificates into the login section of keychain
Select the Kind column, verify the arrow is pointing up, scroll down to certificate, look for all of the following certificates:
DOD EMAIL CA-33 through DOD EMAIL CA-34,
DOD EMAIL CA-39 through DOD EMAIL CA-44,
DOD EMAIL CA-49 through DOD EMAIL CA-52,
DOD EMAIL CA-59,
DOD ID CA-33 through DOD ID CA-34,
DOD ID CA-39 through DOD ID CA-44,
DOD ID CA-49 through DOD ID CA-52,
DOD ID CA-59
DOD ID SW CA-35 through DOD ID SW CA-38,
DOD ID SW CA-45 through DOD ID SW CA-48,
DoD Root CA 2 through DoD Root CA 5,
DOD SW CA-53 through DOD SW CA-58, and
DOD SW CA-60 through DOD SW CA-61
NOTE: If you are missing any of the above certificates, you have 2 choices,
1. Delete all of them, and re-run the 5 files above, or
2. Download the allcerts.zip file and install each of the certificates you are missing individually.
Errors:
Error 100001 Solution
Error 100013 Solution
You may notice some of the certificates will have a red circle with a white X . This means your computer does not trust those certificates
You need to manually trust the DoD Root CA 2, 3, 4, & 5 certificates
Double click each of the DoD Root CA certificates, select the triangle next to Trust, in the When using this certificate: select Always Trust, repeat until all 4 do not have the red circle with a white X.
You may be prompted to enter computer password when you close the window
Once you select Always Trust, your icon will have a light blue circle with a white + on it.
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The 'bad certs' that have caused problems for Windows users may show up in the keychain access section on some Macs. These need to be deleted / moved to trash.
The DoD Root CA 2 & 3 you are removing has a light blue frame, leave the yellow frame version. The icons may or may not have a red circle with the white x
| or | DoD Interoperability Root CA 1 or CA 2 | certificate | |
| DoD Root CA 2 or 3 (light blue frame ONLY) | certificate | ||
| or | Federal Bridge CA 2016 or 2013 | certificate | |
| or | Federal Common Policy CA | certificate | |
| or | or | SHA-1 Federal Root CA G2 | certificate |
| or | US DoD CCEB Interoperability Root CA 1 | certificate |
If you have tried accessing CAC enabled sites prior to following these instructions, please go through this page before proceeding
Clearing the keychain (opens a new page)
Please come back to this page to continue installation instructions.
Step 5a: DoD certificate installation instructions for Firefox users
NOTE: Firefox will not work on Catalina (10.15.x), or last 4 versions of Mac OS if using the native Apple smartcard ability
Download AllCerts.zip, [remember where you save it].
double click the allcerts.zip file (it'll automatically extract into a new folder)
Option 1 to install the certificates (semi automated):
From inside the AllCerts extracted folder, select all of the certificates
click (or Right click) the selected certificates, select Open With, Other..
In the Enable (selection box), change to All Applications
Select Firefox, then Open
You will see several dozen browser tabs open up, let it open as many as it wants.
You will eventually start seeing either of the 2 messages shown next
If the certificate is not already in Firefox, a window will pop up stating 'You have been asked to trust a new Certificate Authority (CA).'
Check all three boxes to allow the certificate to: identify websites, identify email users, and identify software developers
or
'Alert This certificate is already installed as a certificate authority.' Click OK
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Once you've added all of the certificates..
• Click Firefox (word) (upper left of your screen)
• Preferences
• Advanced (tab)
• Press Network under the Advanced Tab
• In the Cached Web Content section, click Clear Now (button).
• Quit Firefox and restart it
Option 2 to install the certificates (very tedious manual):
Click Firefox (word) (upper left of your screen)
Preferences
Advanced (tab on left side of screen)
Certificates (tab)
View Certificates (button)
Authorities (tab)
Import (button)
Browse to the DoD certificates (AllCerts) extracted folder you downloaded and extracted above.
Note: You have to do this step for every single certificate
Note2: If the certificate is already in Firefox, a window will pop up stating: 'Alert This certificate is already installed as a certificate authority (CA).' Click OK
Note3: If the certificate is not already in Firefox, a window will pop up stating 'You have been asked to trust a new Certificate Authority (CA).'
Check all three boxes to allow the certificate to: identify websites, identify email users, and identify software developers
Once you've added all of the certificates..
• Click Firefox (word) (upper left of your screen)
• Preferences
• Advanced (tab)
• Press Network under the Advanced Tab
• In the Cached Web Content section, click Clear Now (button).
• Quit Firefox and restart it
Step 6: Decide which CAC enabler you can / want to use
Only for Mac El Capitan (10.11.x or older)
After installing the CAC enabler, restart the computer and go to a CAC enabled website
NOTE: Mac OS Sierra (10.12.x), High Sierra (10.13.x), Mojave (10.14.x) or Catalina (10.15.x) computers no longer need a CAC Enabler.
Try to access the CAC enabled site you need to access now
Mac support provided by: Michael Danberry
