The other day i was backing up my home folder on my iMac G5 (rev B) to my year-old or so LaCie FW400 D2 drive. everything went fine. later that day i plugged the drive into my girlfriend's TiBook and she got an error message saying the drive could not be read by OS X. i ejected it and plugged it into my iMac and got the same message. ejected, panicked, plugged it in again and clicked ignore whenm i got the error message, and tried disk utility - repair disk. in 10 seconds it fixed a catalog b tree something and the drive has worked fine since. should i still be worried about the drive? or was this an isolated incident?