Recently got hold of a Sandisk Extreme Pro (95mb/s) 16GB SDHC, unfortunately when I insert the SD card direct to my onboard SD card reader on my laptop, the laptop does not register anything. Used a SD Card reader and then plug into the USB port, same problem. No SD card folder popping up, it just doesn't read.
Tried it on 2 other windows 7 desktop pc's, this time using a random brand SD card reader and the same problem, it does not register or load/read the SD card...
However, tried it on a Macbook Pro and the SD card registered and loaded itself fine.
SD card works fine when loaded into my canon 600d, still shots and videos all work. I have done a low level format as well.