Hardware Reference
In-Depth Information
inch areal density. Western Digital introduced the first 2TB drive in early 2009, and in 2010 both
Seagate and Western Digital introduced the first 3TB drives (external and internal, respectively). In
late 2011, Seagate was the first to ship a 4TB external drive, followed by Hitachi with the first 4TB
internal drive. These new high-capacity drives store data at areal densities of 600Gb/sq. inch or
higher.
