Upgraded my iMac 5k 2017 to Catalina 10.15.6 with latest patches, I cannot see the SDcard anymore. How to fix?

[mrjayviper]

As above. I am using the built-in SDcard reader. Thank you!

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I've tried 2 SDcards and both won't show up in:
- Finder
- Disk Utility
- diskutil terminal command


Things I've tried:
- Check System Report to confirm the built-in SDcard reader is still there. It is still there.
- There's no problem reading and writing into the cards using my camera.
- There's no problem reading and writing into the cards using Windows 10 (I tried a different PC)

 

[chscag]

Same thing here with two high end SD 16GB cards. The strange thing is that I have several cheaper SD cards that are no problem reading and writing. I rarely use SD cards though so the two high end cards I tried could have been defective.

 

[colourfastt]

I don't have the exact same problem, but for several iterations now none of my systems will recognise my external HDDs but will read USB sticks. It's quite frustrating.

 

[Taz Mangus]

I don't have the exact same problem, but for several iterations now none of my systems will recognise my external HDDs but will read USB sticks. It's quite frustrating.

You plug in an external drive and the system will not mount it? If you open Disk Utility, with the drive plugged in, what does it show? Have you tired doing a SMC reset?

 

[colourfastt]

You plug in an external drive and the system will not mount it? If you open Disk Utility, with the drive plugged in, what does it show? Have you tired doing a SMC reset?

Neither external mounts, do not show in Disk Utility, nor shows in diskutil. I have done an SMC and a PRAM reset. This isn't a new problem; it started a couple of iterations back, but is common to both my iMac and my MBA.

 

[Taz Mangus]

Neither external mounts, do not show in Disk Utility, nor shows in diskutil. I have done an SMC and a PRAM reset. This isn't a new problem; it started a couple of iterations back, but is common to both my iMac and my MBA.

I suggest you run hardware diagnostics if you haven’t yet.

Try restarting into Safe Mode and see if the issue h

Another thing to try is create a new partition (new Container) on your internal drive. Boot to Recovery Mode (command—key R-key) and install a clean copy of Catalina to the new partition. Restart to the new partition and set it up as a new computer (don’t install any third party software, leave it clean). See if the issue still happens with the clean install. When you are done restart to your current install and remove the new partition.

Use Apple Diagnostics to test your Mac - Apple Support

Apple Diagnostics, formerly known as Apple Hardware Test, can check your Mac for hardware issues.

support.apple.com

How to Start a Mac in Safe Mode: Ventura, Monterey, Big Sur

A user-friendly guide to booting your Mac into Safe Mode to resolve startup issues Safe Mode is a diagnostic tool that disables non-essential programs and services on your Mac, which allows you to remove programs or change settings. To...

www.wikihow.com