If not I bet the top or ROOT directory is full. Which means no more files even if there is space.
I have tried two different brands of 1 gig sd memory cards in three different computers, two with xp and 1 with 2000 pro. always at half full, message: destination drive full, please insert another disk to continue. but when click on that drive in win expl, it showes only half full. Thanks for any help!