It is some actually, according to the regulation of Windows, when allocating dish of accord with at first, left floppy disk A and B, hard disk begins from C, end to Z.
Windows operating system only then at DOS later, graphical operation is great and convenient computer user, especially 1994 the issuance of Windows 3.2 edition, a lot of users of domestic begin to contact Windows operating system from this version.
In those day, because do not have a network, also do not have popular now U dish, commutative file data relies on floppy disk namely between computer, mutual copy is duplicate, so Windows operating system allocated A and B floppy disk.
The floppy disk at that time has volume two kinds of norms, small is 3.5 inches dish, contain incrustation, big is 5.25 inches dish, like disc, it is to be able to store the disk of file data, 3.5 inches are in in Windows department dish be defined to be A chronically dish, another leaves B dish.
Again later, because 5.25 big inches disk carries inconvenience, and easy and broken, slowly everybody uses 3.5 inches only dish, there was computer hard disk later again, windows system C allocation gave dish of accord with hard disk, if there are many hard disks to be used according to alphabetical order in computer, end to Z.
