Apple Promise 1TB SATA Drive Module 1000GB Serial ATA internal hard drive

Promise 1TB SATA Drive Module, SATA, 7200rpm, 32MB cache The Promise 1TB SATA Drive Module is a hot-pluggable 3Gbps 7200-rpm SATA hard drive in a special drive carrier module designed for hot-swappable upgrade or replacement. Advanced active/active MUX circuitry allows the single-ported SATA drive to be controlled by both RAID controllers simultaneously--offering transparent failover.