Seagate EE25 Series EE25.1 20 GB Ultra ATA/100 25pk, 20 GB, 5400 RPM, 8 MB, 2.5", Ultra-ATA/100 Seagate EE25 Series EE25.1 20 GB Ultra ATA/100 25pk. HDD capacity: 20 GB, HDD speed: 5400 RPM, Storage drive buffer size: 8 MB, HDD size: 2.5", Interface: Ultra-ATA/100