Picture this:
mp3s from internet must be downloaded to laptop first before being transferred to ipod.
10GB harddisk space on old laptop.
20GB harddisk space on new ipod.
Greedy owner.
Upset laptop chokes and keels over.
Repentant owner mass deletes files and tries to defragment laptop harddisk.
Defragmentation hits error.
Panicky owner scans laptop harddisk.
Scandisk hits error.

Lesson learnt: Empty stomach before eating.