HP 684594-001 is a 1 TB hard drive for workstation storage, suited to adding capacity for files and applications. Its 3.5-inch internal form factor is specified for a workstation installation.
The drive uses a SATA/600 interface and spins at 7200 rpm. The listing identifies SATA-3 6-GB/s, giving the interface and speed details for this model. It names the HP Z220 Small Form Factor Workstation as a compatible system.