This all new WD 3TB hard drive is part of Western Digital's Blue lineup and features 64MB Cache, SATA 6.0Gb/s (SATA3) connectivity, and is designed for use in all desktop PCs that support the 3.5 inch form factor. This is a rotational drive but a lot of people nowadays combine these with SSDs to act as their storage device (with the SSD running the primary applications). Whether you use this drive as a standalone or couple it with an SSD, you can expect ultra fast access times and real storage power. 3TB SATA 64MB 3.5" HD Blue. The WD30EZRZ hard drive from Western Digital features 3TB of storage size in a 3.5" form factor. This drive connects to your system via the SATA 6 Gb/s interface so make sure you have an available port on your compatible motherboard. Advanced feature of this HDD include a 5400 rotational spin rate.