Lenovo ThinkServer 3TB 7.2K 3.5" Enterprise 6Gb SATA Hot Swap, 3 TB, 7200 RPM, 3.5", Serial ATA Lenovo ThinkServer 3TB 7.2K 3.5" Enterprise 6Gb SATA Hot Swap. HDD capacity: 3 TB, HDD speed: 7200 RPM, HDD size: 3.5", Interface: Serial ATA