MacBook Pro won't read Sandisk SDHC cards since Lion 10.7.1 update

Resetting the PRAM worked for me. Hoorah!!

(Then be sure to unlock SD card if you want to copy it)

I also got a similar problem, though my SD cards were being read even after upgrade to OS X Lion. Only a few weeks past that it started to not recognize the cards. What I did was to clean it using a can of air and it is okay now.

This is a fix for an SD card that won't mount on the MacBook pro SD card reader.

Install the card fully, wait, then remove the card. Wait 20 seconds and then put the card back in 3/4 of the way. The card should mount after a few moments. See:

http://www.youtube.com/watch?v=nbc0l-t3f1Q

I have had the same problem on my iMac with the SD card not showing up in Finder. I tried a new card reader and that wasn't the problem. It turned out to be a super easy fix! Go to Finder > Preferences > Sidebar > then check the External Disks box. Worked for me!

What the bejeesus?

I bought a 32GB Samsung Extreme SD card a few weeks ago and assumed it was faulty when I got it… until I established that it worked fine in a MacBook Air and another MacBook Pro. Assumed it was a faulty slot or etc until I got curious and did a bit more searching just now. I read through this thread with both eyebrows raised, but I installed XQuartz anyway. Rebooted, and the SD card showed up perfectly every time. Truly baffling, but hey, it works!

(This is on Mountain Lion, in case you were wondering. Pretty sure I had the same problem under Lion too.)

Perhaps try reinstalling the latest combo install of your version of OSX -

could.be a driver permission error or a faulty reader if new

The WD40 trick only applies for out of warranty known to have worked gear

If it hasnt worked or broke in warranty take it to apple and they should.replace it without charge if on apple care

Just removed it, blew carefully, reinserted - and it worked.

The older problems above may have been resolved - they had me considering more drastic measures when the solution was quite simple. Try the simple stuff first.

Hi a,

You may want to follow this thread: https://discussions.apple.com/thread/3275548?tstart=0

And look over to the right of this where it says "More Like This" >>>>>

Like PRBoy30 I also resorted to giving the card slot a huge puff, and it now reads my SDHC cards. Hoorayy ! :-)

The solution in this video actually helped me. Just wrap some paper with alcohol around an SDHC-card and put in and pull it out 3 times. It does work! 🙂

mechanical failure for me. i sprayed contact cleaner in the slot and on the SDHC card and it worked. the slot's been flaky since i got it, positionally sensitive but this time nothing worked until a touch of spray.

I have just got a 4GB sandisk micro sdhc card with adaptor, tryed it in my macbook pro retnia it did not work and tryed it in a 2 year old mac book no joy, i have been reading all the forums with no luck.

Went back to my macbook pro retnia put the card in and out a few times with no luck put it back in and moved it from side to side a few times bingo it worked, every time i insert it i have to move it from side to side to get it to work, i am using mountain lion 10.8.2

Hey guys I suggest you try giving it a big air puff first. It solved the same problem we are talking about here. I'm a dentist and some dust from my materials might have gotten into the slot. Thanks for all the pieces of advice though, some may work for others! Saludos from Lima Perú!

Hello,

I solved my problem. I don't advise you to do what I did unless, everything fails. This could break your sd card.

I simply inserted 1 mm of the card and then quickly inserted and removed several times in a row.

I might have done it 10 times. I did it like zack,zack, zack. The last time, I inserted all the way in and left it there.

Problems solved. I can now insert any SD card normally and it will read.

Blowing air into the slot fixed the issue for me.