This is Seagate's first 1TB drive and is a direct competitor to the Hitachi 1TB drive. Seagate's Barracuda 7200.11 ST31000340AS 1TB internal HDD has a 7200-RP M spindle speed and can operate with SATA 3.0Gb/s or 1.5Gb/s with NCQ. Seagate promises the average latency to be 4.16ms and the drive uses a 32MB cache. Four platters and eight heads compose the internals of the drive.