I have a T-mobile Pocket PC phone, and was looking foward to using my new 1GB SD card to store more music and documents on my device. I began happily transferring files to the new card, but the file transfer was stopped midway. If I try to add any additional files, I get an error message saying something like "disk full; remove some files and try again".

I checked, and the memory tab says I have 559.75 used, and 415.88 free, yet I can't add any additional files. Any suggestions?