Adopt cutting edge hard drive technology with Serial ATA and the SATABAY3BK backplane unit from StarTech.com. Designed to hold up to three 3.5" Serial ATA hard drives, the SATABAY3BK comes complete with a cooling fan to keep your drives running at optimal temperatures and two alarms (fan failure and overheating) to alert you in case of failure. Additionally, the frame and drawer design of the 5.25" full height (two bay slots) chassis can increase the number of drives that can be installed inside a case by 33%.