What are the Windows A: and B: drives used for?

Question

In Windows you have a C-drive. Everything labeled beyond that is with the following letter. So your second drive is D, your DVD is E and if you put in a USB stick it becomes F and the following drive G. And so on and so forth. But then, what and where are A and B-drives?

Answer 1

History:

Memory/disk space was limited, so the CP/M and DOS operating systems used "A:" for the first diskette, "B:" for the second diskette (if you had one -- otherwise it would ask you to remove/insert a diskette when it changed drive letters on your one diskette drive so that you could COPY from A: to B:).

The first hard disk (later partition or volume) was letter "C:". Others followed.

The original Windows was built on top of DOS.

Then, Windows became the base operating system (with a DOS-like Command line prompt).

And, life goes on.