It has to do with the historical stuff of computers.
When a personal computer first came out, I used a floppy disk as a storage device.
This is because the floppy disk wrote a and the secondary floppy disk wrote b.
(There was also a tape storage device, but it also used a and b, and it didn't become popular.)
The hard disks that appeared after that were assigned a, b, followed by c.
Most computers in the days when hard disks appeared were using both a and b as floppy disks, so even if you use a, it doesn't become b, but it's set to c.
After that, the floppy disk was naturally disabled, and it became the current way to start with c.
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