The LINDY SAS/SATA RAID Back Plane system is an internal drive housing that supports up to four 2.5\" SAS/SATA hard drives in a single 5.25\" expansion bay. It can easily be installed into a case or expansion system and is ideal for servers and workstations alike, allowing instant hot-swap access to the hard drives. To add RAID functionality, simply connect the back plane system to your computers RAID controller. As the back plane system uses 2.5\" SAS/SATA HDDs (not supplied) it consumes only a fraction of the power used by similar systems using 3.5\" HDDs and requires less cooling - so is quieter to run.