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The C drive (C:) is the main hard disk partition which contains the operating system and the related system files. In Windows operating systems, the C drive as represented as “C:\”, the backlash representing the root directory of the drive. The C drive is considered as the primary hard drive of the system and is used for storing the operating system, system files and other applications and their related files.
The letter-naming scheme for disk drives dates back to the early days of DOS. The letters A and B were reserved for the floppy disk drives, whereas C was assigned to main hard disk partition which had the operating system and related system files. Other letters could be assigned to other hard drives, flash drives or optical drives. In other words, letters were used for determining logical drives, although much later they were also used for specifying the physical storage devices. As the hard disks were smaller compared to today’s, a single letter assignment was all what was needed. Most of the time, the operating system resides on the C drive. However, today it is possible for the C drive to refer to a smaller portion of the larger disk that also has several other drive letters. Hackers, viruses and spyware often target the C drive as it is the default drive for installation of the operating system.