I'm not sure if this is my computer, the card reader, or the MicroSD card.. It it takes FOREVER to do anything with .sav files! The file menu (Either from going to file, or right clicking) won't come up at all. It loads for a good minute and a half, then doesn't do anything. I can delete the save files, but it takes a minute or two.. or more. I can't copy/paste them, I get an error. (Something about IO read something or other) However.. this only happens with .sav files. Roms, folders, music, txt files.. all work perfectly fine. I'm using a Kingdton 1GB made in Taiwan. If that helps at all.