The 3.5-in. Cheetah 15K.5 is a high-performance (15k RPM), high-reliability drive designed for server applications. It's 20% faster than standard 10k RPM drives. The drive is available in a choice of 3-Gbit/s Serial Attached SCSI (SAS), Ultra320 SCSI, and 4-Gbit/s Fibre Channel. It's also available in capacities of 73, 147, and 300 Gbytes. Its mean-time between failure reliability rating is 1.4 million hours at full duty cycle.