Did you ever figure this one out?
I have seen two external Seagate drives (FW, 500GB) stop mounting after about one use on a mac. Neither of them would show up under windows XP or 2000 afterwards.
I reformatted one, and am wondering if I'll need to do the same thing to the other.
Thanks for any info!
Dual 2.5 GHz G5, 1 GB SDRAM Mac OS X (10.4.4)