When Bill Gates was designing computers about 30 years ago,
Bill Gates designed operating systems, not computers. And the first
PCs were in 1981.
he
established the following:
A drive = 3.5 inch floppy
B drive = 5.25 inch floppy
Not true. There was no such thing as a 3.5" floppy on the first PCs.
Both the a: and b: drive letters were reserved forfloppies, and all PC
floppies at that time were 5.25". A typical PC was a two-floppy
machine, both 5.25".
Later, when both 3.5" and 5.25" floppies were around and some people
had both, some had the a: as 3.5 and b: as 5.25, and others had it the
other way around, a: as 5.25 and b: as 3.5. There has never been a
rule or standard that dictated which was which. And some people had
(and still have) two floppies of the same type, either 5.25 or 2.5, on
both a: and b:.
There had also been 8" floppies, but those were never uised on PCs.In
fact the first floppies were 8".
And hard drives didn't exist on the first PCs either.
By the way, although both hard drives and 3.5" flopies were developed
and introduced around 1980/191, they weren't used on PCs until a few
years later.