411 REFERENCE · Wikibooks
SanDisk Sansa MP3 Players/e100
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Unknown artist, unknown album
Some have complained of lots of songs having unknown artist and unknown album. That problem has been tentatively tracked down to a USB cable that truncates the files. Since the ID3 tags are at the end of the files, those could easily be missing if the last 1Kb of the file is truncated. Try another cable, and see if that fixes the problem.