Chosen Solution
After upgrade my imac 2017 5k to macos 10.4.5 not work sd card reader with sd over 32G. I try to donwgrade to macos 10.4.4 but this not resolve a problem. The SD Card (2 different brand) work to macbook air but not on imac 2017 . If I use a 32GB card the card reader work perfecty. I have reset SMC but this not resolve the problem. UtilityDisk read a card but not mount it. Any one have the some problem?
The SD slot is likely dirty. I would first use a can of can’ed Air to see if it can push out any junk. a short blast once in the middle to do it. If that doesn’t work you may want to get a can of electronics cleaner. Just be careful! You want a cleaner which does not leave any oil or other stuff (a clean cleaner!) Again, one short blast is all thats needed then use a SC card (system is turned off) plugging it in and out a few times with a follow up blast after a few tries. Sadly, the SC slot is mounted to the logic board so replacing it is just not possible without a great expense. If your system is still under AppleCare + You should be able top get Apple to fix it under the contract. In any case… I find always having to go to the back of the system to plug the SD in is such a pain! I use a USB-A hub which has a SD card slot which I’ve mounted on my system. Maybe it’s time you do the same. Here’s a nice unit 3-Port USB 3.0 Hub with Multi-In-1 Card Reader For iMac Slim Unibody 2012 or later
