Apple Drive Module - 80GB Serial ATA 80GB external hard drive

Drive Module - 80GB Serial ATA Software and Hardware RAID options
Mac OS X Server includes AppleRAID, providing RAID 0 and 1 support through software, allowing you to increase either data redundancy or performance. Xserve G5 features on-line rebuilding of RAID 1 volumes and is able to boot from RAID volumes. Choose any combination of mirroring or striping across the three drive bays. RAID configurations require a minimum of two ADM hard drives. For higher level of RAID capability, consider the Hardware RAID PCI card CTO option for the lower PCI slot. For higher capacities, consider an Xserve RAID with an Apple Fibre Channel PCI card.

Serial ATA hard drives
Serial ATA hard drives combine low cost with excellent performance. Serial ATA drives features a point-to-point interconnect to that each drive is electrically isolated from the other and multiple drives don't compete for bandwidth. The drives have 8MB of disk cache, operate at 7,200 revolutions per minute (rpm) and use a protocol that enables faster data transfer to and from the hard drive -- 1.5 gigabytes of data per second.

Apple Drive Module Serial ATA Compatibility
Apple Drive Modules with Serial ATA drives are compatible only with the new Xserve G5. For Xserve RAID or older Xserve (G4 based) products, use the Apple Drive Module with Ultra ATA (parallel) support only.