Western Digital Black 6TB 7200RPM SATA 6GB/s 256MB cache 3.5-inch Hard Drive. This drive is great for tons of storage! I have tested the drive and it works great! I've had it in my computer for a few months so it is like new. There are no problems with the drive. It is missing the cover because I had to take it out to fit in my drive slot because the slot is tight. Feel free to ask me any questions!