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SD Card Won't Mount on iMac But Does Reliably on PC

I put my SD card that stores photos into the port on my iMac to read them, only to find that my iMac recognizes the card about 25% of the time. However, when I put them into my PC, they work 100% of the time. I've tried everything suggested by the community support threads, including putting the card in fast or slowly, putting the card in thoroughly and then pulling it out in very small increments until macOS detects it, wiggling the card when I insert it, restarting my iMac, and upgrading my iMac. But all in vain. This issue happens on this iMac and my prior iMac, through several versions of iOS. Why can't my iMacs read SD cards as reliably as a PC?

Best Answered by

iBoysoft author Connie Yang

Connie Yang

Answered on Wednesday, November 22, 2023

Hi, my friend, I have to say, sometimes, the SD card can't be recognized and mounted by macOS properly if you insert the card too quickly or too slowly. So, insert the SD card into the slot on your Mac at a normal speed.

And since you say that the SD card can work well on a PC but only 25% of the time is workable on your iMac, I suspect that the reasons may be the damaged SD card slot on your iMac, SD card corruption, or system bug.

To fix your SD card that not mounting on your Mac, you can try these tricks:

  1. Try connecting your SD card to your iMac through a compatible SD card reader. The SD card slot on your iMac may have some hardware issues, causing the card to be mounted occasionally.
  2. Reformat your SD card on your Mac. Remember get off the files on it first.
  3. Update your Mac to the latest minor update rather than upgrading it to the latest version directly.

If these ways help nothing, go to a local repair center to check if your SD card has hardware issues.

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