If you’re a geek from early generations of computer, the
answer to this question is obvious to you. For younger geeks, however, the A and B drive have always been mysteriously unaccounted for on their computers.
Also, the default installation drive is C drive and other drives in the
computer are labelled with alphabets beyond C like D, E and so on.
Let us get to the answer of this mysterious question.
Older generations of computers used to come with one floppy disk drive which
was labelled as A drive and had no hard drives. Few years later a different
size of floppy disk was introduced, so now there were two variants of floppy
disk-5 1/4" and 3 1/2". So the computers that had both floppy disk
drives, drives were labelled as A drive and B drive.
It was in the early 90s that hard drives became a
standard and so drives were labelled starting from C drive. Gradually the
floppy disk drives became obsolete and A and B drives were phased out and what
remained was C drive.
