Seagate NL35 Series 400GB 3.5" SATA II, 400 GB, 7200 RPM, 8 MB, 3.5", Serial ATA II Seagate NL35 Series 400GB 3.5" SATA II. HDD capacity: 400 GB, HDD speed: 7200 RPM, Storage drive buffer size: 8 MB, HDD size: 3.5", Interface: Serial ATA II