Disk storage, especially the external type, will be even more protected with disk enclosures. These disk enclosures are designed to help protect data with easy transferability. A disk enclosure is a chassis, usually with a bottom tray, top cover, and two side panels. Some manufacturers put a front bezel into the enclosure to provide an easy access when installing a hard drive in it. A disk enclosure is designed to hold the disk drive and provide power into it, while it facilitates the communication between separate computers.
Another benefit is you may add more drive to your PC which its chassis allows to hold. A drive with a separate power supply can be considered another benefit of usb hdd enclosures also.