The most Firewire 800 can handle is around 60-70 MB of throughput mostly due to the fact that cheap firewire controllers are usually the bottleneck. One drive couldn't saturate that. I have two 1640GB drive in RAID 0 in a newertech enclosure and it maxes out at 60MB. I use it for time machine backups. Not worried about losing it as its just a secondary backup.