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SD Card not showing after Mountain lion Update

This is really confusing me.


This morning I used the card reader in the imac to copy files, after the update the imac wont recognise my SD cards (including the one that worked this morning), they are not coming up in disk utility either. However when i take it out i get the error message saying that i never ejected it properly.


Any help would be apreciated!

iMac, OS X Mountain Lion

Posted on Jul 29, 2012 11:18 AM

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Posted on Jul 29, 2012 11:29 AM

Open Terminal (Applications-Utilties-Terminal) and open a Terminal window and copy and paste this command:


Killall Finder


Then insert a SD card and test again. If it still won't work restart the computer in Safe Mode and then restart normally.

46 replies

Oct 2, 2012 11:36 AM in response to rkaufmann87

Own MacBook Pro 15" (mid 2010) Recenlty updated to Mountain Lion 10.8.2


Since I upgraded to Lion (10.7) my MacBook stoped regognizing my SD Cards of my camera. I have tried this Termail thing and OMG THANK YOU!!! Everthing works PERFECTLY! I thought my card reader was busted and didn’t want to book my machine in for a repair.


I recommend this method to everyone with the same problem! Thanks!

Oct 4, 2012 1:19 AM in response to connorfitz89

I don't know how... my SD cards suddenly started working again... I tried all of the above several times and nothing worked for several weeks. In the meantime I installed every mountain lion update available, none of which (at first glance) had anything to do with this problem and nothing worked. However, last week when I started working on my macbook SD cards were recognised again. I do not know what did the trick. I am almost 100% sure this is a not a hardware problem.

Mar 12, 2013 1:16 PM in response to tjhomas

UPDATE: I got it working by doing this:


  • removing SD card
  • running "killall -KILL Finder" in Terminal
  • shutting down
  • starting my MacBook while holding shift
  • inserting SD card


HOWEVER, the next time I rebooted it stopped working. Many others have had this same thing happen, so I just want to confirm that I can re-produce the error.


I regret upgrading from Snow Leopard to Mountain Lion. I have had so many problems.

Mar 19, 2013 9:30 PM in response to CALduenda

So, it's ok for someone to be rude to someone and automaticaly assume it's user error and not an OSX issue, but when we call him on it, our comments get edited but his rude comment stays?


This SD issue has NOTHING to do with user error since cards go in only 1 way, and it has been proven to be an issue since ML upgrade.. Stop being one sided and be equally fair to everyone.

SD Card not showing after Mountain lion Update

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