Seagate Barracuda 4TB 5400 RPM Computing Desktop Internal Hard Disk Drive ( ST4000DM004 )

Compliant with RoHS requirements in China and Europe.
High instantaneous (burst) data-transfer rates (up to 600MB per second).
Native Command Queuing with command ordering to increase performance in demanding applications.
Quiet operation.
SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
State-of-the-art cache and on-the-fly error-correction algorithms.
Support for S.M.A.R.T. drive monitoring and reporting.
Supports latching SATA cables and connectors.
TGMR recording technology provides the drives with increased areal density.
Worldwide Name (WWN) capability uniquely identifies the drive.