The CRU RTX220-3QR is ideal for backup and external storage requirements for workgroups of all kinds, as well as SMB and home office environments. With its USB 3.0/2.0, eSATA, and FireWire 800 connectivity options, the RTX220-3QR provides fast backup or external storage for many kinds of applications. Users have a choice of setting up the RTX220-3QR as a RAID1 mirror, so data is automatically and simultaneously written to both drives, or as a large RAID0 volume to create a speedy solution that incorporates both drives into a single storage volume. The RTX220-3QR can be configured via its easy-to-use interface on the device itself, or through a host computer and CRU's configuration software. In addition to setting the RAID level, users can customize the settings for visual and audible temperature alarms, including what temperature triggers the alarms, and when to turn the fans on. CRU TrayFree trayless bays are durable (rated for over 25,000 insertions) and a breeze to add or swap drives with - open the door, slide a drive in (or pull it out), and close the door. No screws, no trays, no tools.