The Addonics Disk Array 4SA system accommodates up to four 3.5" SATA hard drives. Each SATA hard drive can be easily secured inside or removed from the Disk Array rack with the aluminum slide-out drive drawers.The Disk Array 4SA utilizes the latest SATA 1.0-compliant technology with fast 150MB/sec throughput. It enables the hard drives inside the Disk Array to be set up in different configurations using any number of drives: such as RAID 0 (Disk Stripping for high performance) or RAID 1 (disk mirroring and duplexing for fault tolerance), RAID 0+1 using four hard drives, or four independent hard drives.Users can build a disk array with just one hard drive and then expand as needed. Hard drives can also be hot-swapped to the Disk Array system without turning off or restarting your computer. Each of the four SATA drive drawers in the array also has a point-to-point connection, which requires no cables to make a connection.The Disk Array 4SA mounts inside any enclosure with three open 5 1/4" drive bays in one stack. It is constructed out of aluminum for durability and efficient heat dissipation. An efficient low noise fan system is also located at the back of the unit to ensure sufficient cooling of any high RPM hard drive. The unit also comes with a buzzer alarm and an LED indicator to provide an alert for too high temperatures and for cooling fan failure.Drives used in the array can also be used as an external SATA hard drive with the optional Addonics SATA power adapter and minimize