There was no hard disk in the early days of computers, and then data storage mainly depended on floppy disks. Floppy drives are divided into 3.5-inch and 5-inch, and two different types of disks are placed. In order to facilitate the use and management, in general, the 3.5-inch floppy drive is disk A and the 5-inch floppy drive is disk B.

Floppy disk drives occupy the positions of letters A and B in turn. Later, with the application of hard disk, the letters after C disk can only be occupied in sequence.

And our computer doesn't have a floppy drive now, so there is no AB disk.

Extended data:

With the widespread use of 3.5-inch floppy disks, 5.25-inch floppy disks have been eliminated because of their large size, small capacity and easy wear, and 3.5-inch floppy disks have become the mainstream of floppy disks. So by the end of 1990s, disk B had become history.

Later, with the popularity of erasable optical disks and recorders, as well as the widespread use of U-disks (flash disks) and mobile hard disks, disk A gradually left us. With the discontinuation of 3.5-inch floppy disks and floppy drives, today's computers are often no longer equipped with floppy drives, and disk A has been eliminated.

As a hard drive letter, drive C still defends its position.

For disk A and disk B, there is only one sentence: Have a good trip. I won't forget your past glory.

References:

Baidu encyclopedia-disk a

Baidu encyclopedia -B disk