We all know that there are C drive, D drive, and E drive on the computer, but have you ever thought about why there is no A drive and B drive? Is it even necessary for the computer to debut C?
When the computer just appeared, there is no hard disk. The system and data are stored through the floppy disk. Every time you use the computer, you need to insert the floppy disk of the system into the computer to start the computer, and then change the floppy disk to read the data.
But this is too much trouble, so there is a second socket on the computer that can insert two floppy disks at the same time. In order to facilitate management, they are called A disk and B disk.
The rear hard disk appears, can be directly installed in the computer chassis, but the A disk and the B disk have been occupied, the hard disk can only start from the C disk, which is why the first disk of our computer is the C disk.