Universal Storage Media

Universal Storage Media (USM) is used to describe devices that when connected to a computer, will show up as a storage device (without the installation of additional drivers).

Since the hard drive is a very expensive part of any device, this standard is designed to allow a hard drive to be carried from one machine to another, or rotated among backup generations (current generation (e.g. current month); prior generation (e.g. previous month...) wherein the oldest generation becomes overwritten by the newest generation