This HGST DeskStar NAS hard drive is a reliable internal desktop drive with a storage capacity of 4 TB. It has a 3.5 inch hard drive form factor and supports HDD drive types. The hard drive utilizes a SATA III interface with a cache of 64 MB and a rotation speed of 7200 RPM, making it compatible with PCs in enterprise settings.The hard drive is silver in color and has been previously used. It is important to note that this product contains a chemical known to the State of California to cause cancer, as listed under California Prop 65 Warning. Compatible with machines that do not require a screen, this hard drive has been designed to store data in HDD format only.