rebuilding songdata base

[billyo]

a friend of mine brought her laptop over, she just copied her songs from one drive to a bigger hhd, the guy that did it for her added her name to the original ext drives letter ( ie janedoeE: ) , now she was also telling me that some names on her singers playlist had disappeared, and also when they rebuilt the song database some of the songs won't come up and her songs went from 30k to 25k, i just did a comparison of the drive it seems that all are in there, i've been rebuilding the database for an hr. now, it only has 25,583, it seems that it's rebuilding it in real time, i have a show to do in an hr. and i've tried cancelling it but it still keeps going .by adding her name on the drive would that caused any problem when rebuilding the database?