Why are the computers starting from the disk, and where is the A disk and the A disk?

Why are the computers starting from the disk, and where is the A disk and the A disk?
This is going to be a very important part of the history of computer development, that is the floppy disk. Floppy Disk is the earliest removable media used in personal computers (PCs). The floppy disk is
read and written by the floppy disk drive. The floppy disk has a slow access speed and a small capacity, but it can be loaded and unloaded and is easy to carry. As a removable storage method, it is also the earliest removable medium used on computers.
This is going to be a very important part of the history of computer development, that is the floppy disk. Floppy Disk is the earliest removable media used in personal computers (PCs). The floppy disk is read and written by the floppy disk drive. The floppy disk has a slow access speed and a small capacity, but it can be loaded and unloaded and is easy to carry. As a removable storage method, it is also the earliest removable medium used on computers.

Later, the disk was replaced by a hard disk. I also believe that many people have not heard of this floppy disk. But of course, with the advancement and development of technology, the current floppy disk has basically been eliminated, but according to the habit, the first drive letter of the computer is now named after the disk.

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