I should add, I never transfered data FROM my iPod TO iTunes. I used home sharing to transfer the library from my old computer. That doesn't make four letter renamed copies, does it? I also have an iPad synced to the same itunes, but I don't even have it syncing music to that, only apps and movies.
On a PC, I just moved my whole 100 gig library to a new laptop. Somehow it quadrupled in size, now takes up 432 gigs. Turns out each album folder in "MyMusic" now contains extra copies of the song files, sometimes four copies! Each are named was four random letters, but I can tell the file sizes are exactly the same.
The properly named artist/album/track number version is still there, so these aren't re-coded iPod versions.
Did I do something to create these? Can I just delete them or would that mess up itunes? Is there a way to remove them through iTunes, or just manually go into each folder and erase the duplicats?