How To

How to Repair SD Card Not Reading or Recognized on Mac

Preeti Seth ,

Summary

SD card not recognized by your Mac? Check Finder settings to ensure the card is not hidden. Go to Finder > Settings > Sidebar and check if “External disks” is checked or not. If not, check it. If this setting is in place the next thing you need to do is restart your Mac to reset the USB drive and macOS device detection. If this doesn’t help check the USB connection and connect to a different USB port by swapping to a different card reader. If nothing works, move to advance troubleshooting steps explained in the post.

You have some photos and videos on your camera that you want to transfer to your Mac. As you plug your SD card into your Mac to import them nothing happens. No icon appears on the desktop and when you open Finder, no card is listed. You check Disk Utility; it’s not there too or it shows up grayed out and refuses to mount.

Now what? As there is no indication whether the card is dead, the reader is broken, USB port has failed or if there is something wrong with Mac. What can be done? This troubleshooting guide explains what you can do to fix the problem and get the content from the card.

Why SD cards stop working on Mac

SD card usually stop working on maths due to the following primary reasons:

  1. Reader or connection failures. USB based card readers are reliable but when they fail there is no sign because it can be the cable that is broken the USB port my stop recognising certain devices while they are charging there is no country reason why they fail because of this the issue look frustrated
  2. File system incompatibility – Mac supports FAT32, exFAT, and APFS file system. If the card was formatted to another file system or the device it was used with uses a different file system then too Mac will fail to read it. Also, if it was corrupted during a write operation macOS cannot read it.
  3. USB devices not recognized by macOS – This is a rare occurrence but we can’t overlook it. It is generally fixed by restarting the device and in some cases by updating macOS.
  4. Physical damage – The card is flexed, or water got inside that damaged it physically.
  5. Locked SD card – This again is not common but there is no harm in checking.

Quick diagnostics

Before running any fixes, answer the following questions:

1. Is the card showing up in Finder or Disk Utilities?

Connect the card. Go to Applications > Utilities > Disk Utility). On the left sidebar look for the SD card. Can you see it, even if it means it is grayed out or marked as “not mounted”?

If yes the card is detected and the problem is likely with Finder settings or file system corruption.

If not there can be an issue with the reader, cable, USB port or the card can be physically damaged.

2. Does the card work on another device?

Try connecting it to another device with an SD slot, if it works there is a problem with the reader or your Mac. If it doesn’t work the card is most likely corrupted or damaged.

3. Does a different card work in your reader?

Try reseating another SD card in the reader, if it works there is an issue with the card or how it was formatted. If it doesn’t, the reader is broken.

Also Read: How to Fix a Frozen MacBook

Once you have answered these questions you will be able to go directly to the right fix.

How to Fix SD Card Not Reading or Recognized on Mac

Fix 1: Check Finder display settings

If the card is visible in Disk Utility but not on the desktop or in the Finder sidebar, an external disk hidden option is probably enabled.

To show external drives in the Finder sidebar:

1. Open Finder.

2. In the menu bar at the top, click Finder > Settings (or Preferences on older macOS versions).

3. Click the Sidebar tab.

4. Under the Locations section, check External disks.

To view external drives on your desktop:

1. In the Finder settings > click the General tab.

2. Under Show these items on the desktop, check External disks.

You will now be able to see the SD card on your desktop and Finder sidebar. If it doesn’t appear, refresh Finder or reinsert the card.

Fix 2: Restart your Mac

Restarting Mac reloads all the USB drivers and refreshes device detection. If that is what was causing the issue it will be fixed with this routine step.

1. Click the Apple menu in the top-left corner.

2. Click Restart and confirm the action.

After restart connect the SD card and check if it appears.

Fix 3: Force-remount the card

If the card is grayed out in Disk Utility with “not mounted” underneath, the card was detected but not mounted to the file system. This happens when the card was not ejected properly or was interrupted during a read/write cycle.

1. Open Disk Utility.

2. In the sidebar, look for your SD card.

3. Click on it to select it.

4. At the top of the window, you will see a Mount button. Click it.

This will mount the card and you will see it in the Finder. If you get an error message or nothing happens chances are that the file system is corrupted.

Fix 4: Check USB

1. Clean the card and the reader then reinsert it into the reader.

2. When reinserting the card and ensure it clicks when you place it.

3. Check the USB cable.

4. Try connecting the reader to a different USB port.

5. If you’re using a USB hub, connect the reader directly to your Mac.

If you’re using a built-in SD card slot (on older MacBook Pros):

  1. Power off your Mac. Insert the card with the label facing up.
  2. Power the Mac back on and wait for it to fully boot before checking if the card appears.

Fix 5: Check SD card

When a SD card is locked it cannot be detected and read by your Mac. Ensure that is not the case by looking at the side of the SD card. If it is in the locked position slide it forward to unlock and try reconnecting the card.

Fix 6: Update macOS

If you are working on an older version of macOS there can be compatibility issues preventing SD cards to be read. Update your macOS to rule out it.

1. Click the Apple menu > System Settings.

2. Click General > Software Update.

3. If an update is available, install it and restart your Mac.

Fix 7: Test the card on another computer

If you have access to another Mac, Windows or any other device with an SD slot, test your card there. If the card works on it there is a problem with your Mac or the reader. However, if the card is not working it is probably physically damaged or corrupted.

Fix 8: Check System Information

Before you format the card check if the card is detected or not.

1. Click the Apple menu > About This Mac.

2. Click System Report.

3. In the sidebar, click USB.

4. Look through the list of connected USB devices. See if you can see your SD card reader or the card.

If you can see it in the System Report, then it is detected by your Mac but there is a problem between the hardware and Finder which is preventing proper mounting or display.

In such a case if you have not yet restarted Mac, restart it the card will be detected.

Fix 9: Format the card (last resort before recovery)

If you can see the card in Disk Utility, but cannot access the files or it won’t mount, formatting makes it usable again. However, remember doing so will erase all the data on it.

Format using Disk Utility:

1. Connect the card and open Disk Utility.

2. Find your SD card in the sidebar and click on it.

3. Click the Erase button at the top.

4. Name the card for identification and choose the file system:

  • FAT32 if the card is 64 GB or smaller
  • exFAT if the card is larger than 64 GB

5. Click Erase and wait for the process to complete.

The card should now be detected. In case this doesn’t help, probably the card is damaged.

Fix 10: Recover files before reformatting

If the card is showing up in Disk Utility but won’t mount, or if it’s showing as RAW or corrupted, before you format it you can recover data using a data recovery software.

Using Finder’s built-in recovery (limited but free):

If the card is visible in Disk Utility but won’t mount, right-click on it and select Mount.

If this works you can get the files without using a third party recovery software. If this doesn’t you will need to use a third-party data recovery software like DiskDrill, Stellar Data Recovery, or EaseUS Data Recovery. These tools can scan an unmounted or corrupted SD card and recover files.

You can download the free trial version of the tool you choose and see if it helps.

Also Read: How To Clear RAM On A Mac

Things to Keep in Mind To Avoid Facing SD Card Not Detected

If you’ve gotten the card working, keep these tips in mind  to prevent this from happening again:

  1. Eject the card before removing it
  2. Avoid using cheap card readers as they often fail.
  3. Keep the card in a case to prevent it from physical damage.
  4. Format the card not Mac.
  5. Always keep a backup.

Frequently Asked Questions

Can I use an external SSD instead of an SD card reader to transfer files from my Mac to another device?

Yes. These days instead of using SD cards people use external SSDs as they are faster and more reliable.

My card works on my camera but not my Mac. What's the issue?

Generally this means Mac's reader isn't compatible or is not working. Try another card reader.

Is it safe to use a microSD card in a Mac with an adapter?

Yes, microSD cards with adapters work fine.

How long do SD cards usually last?

Quality SD cards last 10+ years if not heavily used.

Can I recover files from a formatted SD card?

Yes unless it is reformatted and you have written other data on it.

Wrap Up

You can get the SD card working if there is no physical damage after following the instructions above. If the card appears in Disk Utility but not in Finder ensure it is not hidden and try to mount it manually through Disk Utility. If this doesn’t help and you cannot see the card restart Mac, check for the SD card lock and System Report to ensure there is nothing wrong with your Mac. These steps will help understand the cause and fix it, if it is not physical.

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