Found another REALLY nasty bug, which has wiped out two hard drives now. While copying files to a 300GB drive close to it's capacity (around the last 15GB or so), all contents of the folder being written to (games / videos) were deleted, other folders on the drive were emptied, and lots of files were corrupted -- plus the space on the HD was still occupied! It happened to me when tranfering videos via FTP, and to my friend last night when backing up a game via UnleashX's built-in game copy function. There is no way to salvage the files, and since the space is just being wasted, the only solution is to wipe the drive and start fresh -- not happy.
Perhaps UnleashX has a problem with a large capacity HDs? I've modded around a half dozen boxes and have never encountered this problem until I started installing 300GB drives. Below are the specs on our boxes (both are the same):
XBOX v1.0
X-Chip w/ 1.5 Solderless adapter
EvoX X-Chip BIOS
Seagate 300GB 16MB buffer
Unleashx V0.38.0515a Build 565