What is the local C drive on a computer?

Answer 1

MSDOS and Microsoft Windows identifies drives by single letters (many other operating system allow drives to be named with words or phrases):

1. drive A the first internal floppy diskette drive (usually not used anymore)
2. drive B the second internal floppy diskette drive (usually not used anymore)
3. drive C the first internal hard disk drive
4. drives D through Z additional drives, may be internal or external, hard disk drives or optical drives, etc.

Answer 2

The local disks of a computer are the drives that are directly attached to the computer. That is distinct from network drives which are accessed over a network and not physically attached to your computer. So a local disk is a drive on your computer and not on someone else's computer.