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Before bootable CD drives came along, floppy drives were provided with

letters A and B. Now, either the bootable CD or floppy may take A.

The next sequential letter is C. This is usually the first active, primary

partition found on a hard drive. Its also dependent on the

active/primary/logical partition hierarchy scheme system. Its possible to

boot from floppy or CD, and a logical partition may take drive letter C, if

no primary partitions exist for instance.

Originally, PCs had no hard drives. They ran on big oversize floppies. B

designation came later, and was commonly used as a data diskette. The hard

drive came along, and logically, its partition took the letter C.

A cd drive can take the letter C, if no detectible hard drive partition

exists. Designating a latter letter for the cd drive with driver modifier

is the typical solution used. This is only seen with floppy boot media like

a 98 startup diskette for instance. The former can be seen, under the right

conditions, with a simple boot diskette.

Magneto floppies (if not bootable), pen drives, CD/DVD and so forth follow a

letter hierarchy specific to windows. And in some cases, can be modified by

the user. With the advent of XP, even more latitude is provided for drive

letter changes by the user.

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Q: Why hard drive labeled letter c and not letter a or letter b?
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