Desktop computer hard drives are the primary and largest form of storage on a computer. Vital software such as the operating system and application files are stored on computer hard drives. So is end user data ranging from desktop documents and digital images to music and video files. The disk drive is sometimes referred to as the 'C' drive, something that came about from the most widely used operating system Microsoft Windows that by default assigns the letter C to the main drive or partition on a computer.
Of course, it is not technically correct to use the 'C' drive to refer to the hard drive but the term is still widely used. A single hard drive can be partitioned into several logical drives allowing the end user and the system look at each partition as a somewhat independent disk. Desktop computer hard drives are some of the most in demand computer accessories and there are many electronics companies that manufacture disk disks. When looking for disk drives, the two aspects you must pay the most attention to are the size and speed.