Snap-In Mobile Rack is a family of innovative removable drive systems that enable the hard drive to be used like a VHS cassette. Unlike conventional removable drive system that uses a proprietary tray to add or remove the hard drive, the Snap-in Mobile Rack requires no tray or any special tool to add or remove the hard drive from a system. All you need is to open the drive door of the Snap-In Mobile Rack, slide the drive into the drive slot, close and lock the drive door to engage the drive connection to your computer. When using in conjunction with a controller supporting hot-swap feature, which Addonics offers a wide selection of this type of controller, you can add and remove hard drives without even restarting your computer.