I was copying and deleting some files on my mp3/mp4 player and all my files (songs and videos) have all disappeared, but i know they still exist on my mp3 player because my memory usage hasn't changed. Does anyone know how to fix this? Would defragmenting the player on my computer work?
Sorry i don't know what brand it is because i bought it on ebay.
Can anybody plz help???:-|

Hmmm. The only thing I can think of is enabling hidden folders to go look for them in the drive itself.

Just be careful, when hidden files are enabled, the system folders will be there (in the C: drive). Don't touch anything in there.

1. Close all programs so that you are at your desktop.
2. Double-click on the "My Computer" icon.
3. Select the "Tools" menu and click "Folder Options".
4. After the new window appears select the "View" tab.
5. Place a checkmark in the checkbox labeled "Display the contents of system folders."
6. Under the "Hidden files and folders" section select the radio button labeled "Show hidden files and folders."
7. Remove the checkmark from the checkbox labeled "Hide file extensions for known file types."
8. Remove the checkmark from the checkbox labeled "Hide protected operating system files."
9. Press the "Apply" button and then the "OK" button and close My Computer.

unfortunately that didn't do the trick. but i was thinking of downloading a hard drive data recovery software

Hogsmeade2000, did you find your answer? The same thing just happened to my keychain drive (PNY 1GB). The old files take up space, but they are invisible. I can see new files just fine.