The last time
we heard from ioSafe they were taking 2.5-inch HDDs, wrapping them in armor, then stuffing them into 3.5-inch enclosures -- adding fire and water protection in a standard form factor. Now they've given up on the internal route and have gone for something a little larger and more durable, fitting Western Digital
disks into hardened external USB 2.0 cases capable of being submersed in ten feet of water for three days or surviving a raging inferno for 30 minutes. $199 gets you a 500GB model, but, since you'd probably have a hard time upgrading the drive in there without a jackhammer, we'd recommend going straight for the $349 1.5TB model -- early adopters get a tidy $50 off!Update:
Jason commented to let us know they also use Seagate drives.