The Fantec MR35DU3e is a super speed USB 3.0 + eSATA enclosure with RAID function. By the use of two HDD?s you have new area of applications and a huge storage capacity. The enclosure's screwless technology allows to change the HDDs without any tools quickly and easily.The 70mm fan cools the hard drives and complements the functionality of the FANTEC MR-35DU3e. The device can be used on older computer, too, because it's downwards compatible to USB 2.0 and USB 1.1For use with 2x 3,5" SATA hard disks.Easy installation by plug & play.RAID 0 -Stripping Mode: Maximum Speed through two simultaneous working HDDs.BIG - Spanning Mode: Two HDDs combined to one single HDD. (no Raid).RAID 1- Mirroring Mode: Maxiumum security by HDD mirroring.JBOD Mode: Two independent HDDs (no Raid).6 LED- indicator for Power on, HDD activity (HDD1, HDD2) and RAID mode. Internal Power supply.