SCSI's are very reliable. The space between the reliability of scsi and the reliability of ATA is steadily decreasing, though. You can buy a good Seagate ATA HDD and have it last for years with no problems. (I can vouche for that a dozen times over.) I've had one Seagate 80gig drive for over six years, and it's still running great! After 3 moves, in and out of cases, power failures, being dropped once (at least, I think...) and deplorable in-box conditions, that lil' sucker is still going. It's got my MP3 file and email backups on it right now, at work.