Hi everyone; thought I'd offer a tip.
Sometimes my Mac Mini (2010 unibody server model) will recognize an SD card... but then after it's ejected, it won't recognize a new one inserted -- sometimes not even the same SD card. The Mac Mini just refuses to mount a SD card after the original card is pulled out/ejected.
This tip from 2011 for iMacs appears to work quite well to fix this issue... at least one my Mac Mini.
http://cvil.ly/2011/10/30/imac-sd-card-reader-fix/
"Turns out this is not a software problem, but a hardware problem. There is a small switch inside the card reader that signals to the computer that a card has been inserted. This switch can get stuck."
"The solution is to insert a toothpick or other non-conductive “stick” into the SD card slot to free up the switch. According to posts on the Apple site, the switch is located at the top/back of the card slot. I also poked around the bottom/back of the slot for safe measure (I never actually saw the switch). After “flossing the inside of the slot a couple times, the reader works once again!"
Remember! Don't use any metal or other conductive materials! Do use plastic or, if you're confident you won't leave splinters behind, a wodden toothpick!
Odd error for the Mac Mini SD Card slot, and odd fix, eh?
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Mac mini, OS X Mountain Lion (10.8.3)
