Why "C" is the default partition on windows.

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For nearly as long as hard disk drives have been placed in personal computers running certain popular operating systems (notably MS-DOS/Windows), Where had the A and B drives gone? the primary hard disk has been designated with the letter "C". But why?

C default drive

The idea for designating different storage devices with simple letters is generally attributed to IBM’s virtual machine operating systems developed in the 1960s, starting with their CP-40 and CP/CMS systems, and later very notably, among others, copied by the CP/M operating system created by the company Digital Research, Inc. In the early systems (CP/CMS) the letters were used mostly to designated logical drives, although later (such as with CP/M), they were used to specify physical storage devices.

This all brings us to 1980 when IBM attempted to use the relatively popular CP/M operating system on the IBM Personal Computer. Talks broke down between IBM and Digital Research, Inc, for reasons not totally clear today. The trouble is rumored to have started when Dorothy Kildall, the wife of CP/M creator Gary Kildall, refused to sign a non-disclosure agreement with IBM at the start of the negotiations. She supposedly told them she would not sign such a document without speaking with her husband first, who was out of town on business. This was a somewhat unusual move as Gary often left such business negotiations to her anyway.

Floppy Disk

Some systems came with two such floppy disk drives necessitating the need for a "B". When the 3.5" floppy disk (which wasn't actually floppy at all unless you took it apart to get at its innards) was commonly added, using both "A" and "B" for floppy drives was firmly entrenched.

When hard disk drives became standard in most PCs in the later 1980's, since the first two letters were already commonly used for these floppy drives, they logically labeled the third storage device "C", even though it now tended to be the main storage medium for the computer, including usually containing the operating system.

Despite that exceptionally few systems today still contain floppy disk drives, this schema of drive designation has stuck around anyway, with "A" and "B" often still by default reserved for floppy drives. Of course, these letters aren't set in stone on modern systems and you can easily change, remove or add drive letters (representing both physical and logical drives) if you have administrative rights.

Hard Disk

• Before hard disk drives, Floppy disk drives were used as the storage devices.
• Floppy disk drives were the initial storage devices. They came to existence since 1960's.
• Floppy disks came in two sizes 5 1/4" and 3 1/2".
• Those two floppy disk drives were labelled as Local Disk A and Local Disk B
• After the invention of Hard disk, floppy disk of size 8 inch came into existance.
• Presently Floppy disk drives and Floppy disk drivess replaced the floppy disks.