Some computers may still have these, but back in the older day, the A: and B: drive were reserved for use as Floppy Disk Drives. The reason you might not have heard of these drives is because all big computer fabricators generally stopped including them on personal computers in 2003.
It was common to have two drives, hence why A & B are reserved. This is because of drive incompatibility, there wasn’t a set standard at the time and so you had to be prepared to read media that was formatted differently. It's not that computers don't have B drives. Initially, (hardly two decades ago), personal computers didn't have hard discs they were equipped with two floppy drives called drives A and B. Later, a hard disk was introduced and was labelled as the C drive. Other drives like the CD drive, DVD drive, flash drive and others were labelled D, E, etc. If you have a computer having two floppy drives, then they are called A drive and B drive. Source:Internet
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