Hard Disk Drive…
A hard disk is the main reusable storage device, which holds information, such as software programs or data, in the form of files. Information is permanently saved on disk can be retrieved repeatedly for future use until the user consciously decides to discard or overwrite it. There are many storage devices, I have listed three types below:
- A hard disk (HDD) also known as a hard drive, fixed drive, fixed disk drive. A hard disk drive is a non-removable disk inside the CPU “box.” The hard drive usually designated as the “C” drive is usually the size of a paperback book. Hard disks provide two obvious advantages massive storage of data and fast access to data.
- An external hard drive is outside the CPU “box” stored in its own enclosure. External hard drives are very popular because they are portable devices and can be stored securely under lock and key since they are not inside the CPU “box.” Biggest drawback to the external hard drive is that they are relatively expensive.
- A floppy disk drive (FDD) holds removable floppy disks. Floppy disks are portable and transportable, but they hold much less information than hard disks and require much greater access time to retrieve this data.
A letter designates each disk drive so that the computer can conveniently send instructions to and receive information from the disk. Traditionally, a single floppy drive is the “A” drive. (If dual floppies are present, they are designated drives “A” and “B”). A floppy disk is similar to the hard drive; it operates on the principles of magnetic recording. Made of a thin plastic disk covered by a layer of metallic particles, the floppy disk uses magnetic heads for data storage and retrieval from the rotating magnetic media.
The history of floppy drives began with the introduction in 1970 with the first 8-inch floppy drive. It was replaced by the 5.25-inch drive in 1976 and then followed by the 3.5-inch “micro-floppy” in 1980. The Floppy disk low-density capacity for the 5.25-inch floppies is only 360 kilobytes of information and for 3.5-inch floppies is only 720 kilobytes of information. The Floppy disk high-density capacity for the 5.25 inch floppies is only 1.2 megabytes of information and for the 3.5 inch floppies is only 1.44 megabytes of information.
As new technology has definitely had an impact on floppy disk storage, this option still may function as boot disks in the case of a system conflict on a PC or for those individuals who still have not upgraded their computer systems.
To read more articles on Computer basic concepts, please check out the following links.
Computer basic concepts (part 1)
Computer basic concepts (part 3)
Computer basic concepts (part 4)
Computer basic concepts (part 5)
Computer basic concepts (part 6)
Computer basic concepts (part 7)
Computer basic concepts (part 8)