Well designed with quality parts. There are several reasons why this is one of the most useful devices I have ever installed into the tower case. Accessibility - You simply insert your finger into the front panel door latch and pull. Internal mechanical linkage then pushes the drive forward for easy automatic disconnect and removal. Power Switch - The slide switch located just above the LED indicator can be moved to the OFF position to power-down the drive. And of course when the drive is not spinning, it is non-existent as far as the operating system is concerned thus becoming hack proof. However, it will still appear among the listed drives. Therefore, each time a drive is powered down or swapped with another, you should go into Device Manager, right-click on Disk Drives and select "Scan for hardware changes" to update listed drives. The shortcut for Device Manager is Windows Key + R. In the Run box that appears, enter devmgmt.msc. Hard Drive Activity LED - The power LED is normally blue but then alternates between blue/red when there is disk activity. USB 3.0 Ports - There are two USB ports supplied on the front panel of the mobile rack via a connecting cable terminated with a USB 3.0 plug that you attach to the motherboard header pins. If your motherboard does not have USB 3.0, you can obtain an add-on card that plugs into the spare video card expansion slot. USB 3.0 can supply 0.9 amps (900 ma) capable of charging external devices such as rechargeable batteries, cell phones, or music players. Ideal for external backups or booting to an alternate operating system.