What Does Disk Usage (DU) Mean?
Disk usage (DU) refers to the portion or percentage of computer storage that is currently in use. It contrasts with disk space or capacity, which is the total amount of space that a given disk is capable of storing. Disk usage is often measured in kilobytes (KB), megabytes (MB), gigabytes (GB) and/or terabytes (TB).
Techopedia Explains Disk Usage (DU)
Disk drives date back to the 1950s, when computer scientists, engineers and manufacturers sought new forms of electronic storage (prior to this, data was primarily stored on magnetic tape).