I recently bought a CycloDS and a 4gb A-Data card, which both arrived today. When I plugged it in to my computer, it recognized fine, and then I made the mistake of moving my files over, instead of copying, being low on HD space. When I unplug the MicroSDHC, I put it into my Cyclo, and it says to insert it. I'm now thinking I have a defective MicroSD slot on my Cyclo, but no, I plug it into my computer again, and alas, it shows up as "Removable Disk" with 0kb of total space and 0kb used. . I'm about to kill somebody, because I'm pretty sure you can't return items you've purchased online (Newegg.com). If somebody could help me or point me in the right direction, it would be greatly appreciated.