MacBook Pro 2011 Not Recognizing SanDisk Class 10 SD Cards

A few people are reporting that a Class 10 SanDisk SD Card won't be reliably recognized in a 2011 MacBook Pro.

What does seem to work as a temporary workaround is restarting the Mac with the card already inserted. But even then it's not recognized if you remove the card and then reinsert it or another similar card.

"I use a Sandisk SDHC Extreme Class 10 SD Card and have problems getting it to read through the inbuild SD card reader.

I tried the following:

Reformatting on Disk Utility
Reformatting on my Canon 450D
Restarting Laptop
Resetting PRAM
Resetting SMC
Repairing Disk Permissions
Repairing Disk

All of these did not solve my problem. I have a card reader which when plugged into the MBP, works fine and detects the card.

The Weird Part

I plugged the card into a friend's iMac and it detects it every time. And then right after I do that, I plug it into my MBP, and it detects the card, but the problem is once I eject it, and slot it back in, it fails to detect again! However if I try this method again (Slot to iMac, remove, slot back to MBP), it will fail the second time. "


Someone tried a card in MacBooks at an Apple store and:

"They had me EFFA back the machine, and provided me with a new one. I tested the new one right out of the box and it worked fine, but after Migration, it no longer worked. Restoring using the included disk back to factory specs DID NOT restore the ability to read the card.

In checking random machines at the apple store, only 1 on the entire floor recognized that a card was inserted, when I tried the Sandisk SDHC Extreme Pro 8GB 45MB/S card."


Apparently Apple and SanDisk are aware of the problem but if you use SD Cards for production or have them sent to you for editing it's a good idea to be aware of this issue. I've not seen it as I've been using an external USB card reader. Hopefully it'll be addressed soon with a software update.