Home > Questions

SD card is not visible on my iMac but works fine on my MacBook. Any help?

Running Mojave 10.14.3 on the iMac. The SD card does not show up in finder (yes I checked Finder preferences). Using the internal SD card reader and it is listed in disk utility but I'm unable to mount the drive. I have a USB connected card reader and it won't read there either. But the SD card works normal on my MacBook. Help please!

Best Answered by

iBoysoft author Amanda Wong

Amanda Wong

Answered on Thursday, January 12, 2023

If your SD card is not visible on your iMac but works fine on your MacBook, the problem may relate to iMac's SD card slot, the internal SD card reader, an outdated disk driver, macOS corruption, or other system-wide issues. To fix this problem, you need to ensure a good connection between your SD card and your iMac, update the disk driver, reset NVRAM, etc.

In the first place, to help narrow down the issue, I want to know whether you connect the SD card to your MacBook with the same card reader and if the SD card works fine there. If your answer is yes, then it is confirmed that both the SD card and the card reader function well. It should only be problems related to your iMac.

When an SD card not working on Mac, or the SD card not mounting on Mac, we can analyze the problem from three aspects: the SD card, the connection, and your iMac. As the SD card is already ruled out, then it comes to the connection issue. If you straightforwardly insert the SD card into your iMac's SD card slot, you should make sure the slot is compatible and working. If you connect the SD card reader via a USB port, you can change another USB port on your iMac to see whether it helps.

In case there is no problem with the connection, the SD card is still not visible or mounted on your iMac, then you can try other working solutions: 

  • Update the disk driver. Perhaps the disk driver on your iMac is outdated or corrupted, then it leads to the SDB card invisible and not mounting issue. You can update the disk drive by updating macOS from the Apple menu > System > Preferences > Software Update.
  • Restart your iMac. It is probably the system errors that make the SD card malfunction on your iMac. Then restarting it may fix the problem with ease.
  • Reset NVRAM. NVRAM stores setting information from your Mac model and its connected devices. When your SD card is invisible and not mounting, you can try to reset NVRAM on Intel Mac by holding the Option + Command + P + R keys while restarting the Mac. On an Apple Silicon Mac, you just need to restart the Mac to reset NVRAM easily.

People Also Ask

Read More Questions

Read More Advice From iBoysoft's Computer Experts

usb flash drive not showing up on Mac

Fix USB Flash Drive not Showing up on Mac [Solved]

Troubleshoot and fix Mac not recognizing USB flash drive, flash drive not showing up on Mac desktop, in Finder or Disk Utility.

How to Tips

Cant partition SD card USB drive hard drive on Mac

[Fixed] Can't Partition SD Card/USB Drive/Hard Drive on Mac?

Can't partition SD Card/USB Drive/Hard Drive on Mac? Here are solutions to the Partition button, ( +/- ) button, or ( - ) button grayed out in Disk Utility.

How to Tips

macos ventura recovery mode missing

macOS Ventura Recovery Mode Missing, Try These Fixes!

This article offers fixes for the macOS Ventura recovery mode missing problem. After reading, you will be able to fix macOS Ventura's broken recovery mode and get alternative recovery options.

How to Tips