5.25in Trayless Hot Swap Mobile Rack for 3.5in SATA HDD with LCD & Fan. The HSB110SATBK 5.25-inch Trayless Hot Swap Mobile Rack for SATA Hard Drives (with built-in LCD) enables users to quickly swap 3.5-inch SATA hard drives (HDD) from a standard 5.25-inch bay. The mobile rack features an integrated, backlit LCD screen that displays the operating status of the hard drive, monitoring the drive temperature, cooling fan speed and continuous up-time of the HDD. The mobile rack also features customizable warning thresholds that trigger buzzer warnings in the event the HDD gets too hot or the cooling fan fails. Removing/replacing hard drives from the mobile rack is as simple as opening the front panel door and pulling the drive out, then sliding a new HDD into the opening and closing the door. The trayless design makes the process of changing hard drives quick and painless, as there are no enclosures or trays/caddies to deal with.