Seagate NL35 Series NL35.2 Series 500GB HDD 8MB SATA, 500 GB, 7200 RPM, 8 MB, 3.5", Serial ATA Seagate NL35 Series NL35.2 Series 500GB HDD 8MB SATA. HDD capacity: 500 GB, HDD speed: 7200 RPM, Storage drive buffer size: 8 MB, HDD size: 3.5", Interface: Serial ATA