The Logic Off Topic list

>attempting to backup my  TiBook internal drive to an external Firewire
>drive, i have experienced some troubling results.  after backing up tons
>of samples and song files, the firewire drive has become corrupt.

I have had the exact same experience several times. Don't panic. Get 
Diskwarrior. It will rebuild the directory, and your data is safe. I also had 
it work well by turning the drive off, and plugging in to a different Mac.