Seagate Momentus 5400.3 120GB Ultra ATA/100, 120 GB, 5400 RPM, 8 MB, 2.5", Ultra-ATA/100 Seagate Momentus 5400.3 120GB Ultra ATA/100. HDD capacity: 120 GB, HDD speed: 5400 RPM, Storage drive buffer size: 8 MB, HDD size: 2.5", Interface: Ultra-ATA/100