Seagate Cheetah 18.4GB HDD, 18.4 GB, 15000 RPM, 8 MB, 3.5", SCSI Seagate Cheetah 18.4GB HDD. HDD capacity: 18.4 GB, HDD speed: 15000 RPM, Storage drive buffer size: 8 MB, HDD size: 3.5", Interface: SCSI