I am running a MIUI ROM, though I doubt it has anything to do with it. Specific version is 2012.5.12. I tried everything to try and format this card to get it recognized, but I have yet to do so. I tried the command prompt, Fat32Format, Windows 7 right click format, Windows 7 Disk Management and some other format GUI. None of which could detect it well enough to format. It might be dead as it was the stock 16GB mSD included with the DROID X. But does anyone have other ideas?