This may be of interest. I have 3 - 4 drive SCSI cases around here that are a little long in the tooth with 2.5GB Baracuddas that have been spinning 24/7 since (?98-99). I used them on the server and mirrored them so each box represented 2 logical drives. It's been a good setup. Course these drives have max throughput of 20mb/sec, a fraction of SCSI 320. I bought 1 1394 two port Firewire card ($50) with 2 FireWire Cables ($7ea) ,2 Granite Digital FireBridge 1394's ($59ea) and the Centronic adapter plate to mount in the SCSI cases($10ea) and two 80GB Seagate Baracudda IDE drives ($80ea). Pending the Outcome of the two drive test, I am going to put two 120GB Western Digital WD1200JB ($110ea) in the other two slots for a total of 400 GB of storage or 200GB Mirrored Storage for $582.
Each BridgeBoard supports 2 IDE/ATA drives up to 137GB (There is a BridgeBoard that is a tad more $, maybe 20 bucks that supports a couple of terabytes) . Firewire is 400mb/sec and the Granite BridgeBoard is 40mb/sec and the drives themselves vary from 17mb/sec to 100mb/sec, so other than not being multitasking like SCSI, it's linear like IDE, it still gives a huge bang for the buck. Thought I would pass it along for you that are struggling with graphic and multimedia storage.

