Hi suddenly my iMac is not reading SD card anymore. An external reader (very cheap) is doing a good job. Where's the problem?
Try restarting your iMac then try the card.
About the SD and SDXC card slot
Article is designated for v10.7 Lion but may apply to v10..8 as well > OS X Lion: Use an SD card
Tried that, but it's still not working!
Retrieving data ...