Seagate Momentus 5400.2 40GB Ultra ATA/100 5400RPM 8MB 25pk bulk, 40 GB, 5400 RPM, 8 MB, 2.5", Ultra-ATA/100 Seagate Momentus 5400.2 40GB Ultra ATA/100 5400RPM 8MB 25pk bulk. HDD capacity: 40 GB, HDD speed: 5400 RPM, Storage drive buffer size: 8 MB, HDD size: 2.5", Interface: Ultra-ATA/100