(Hard Disk Drive Technology)
Group 3: Instructor:
Tyrone James Dumandan Mr. Allen Paul Aclan
Renz Niño Mercado
BSCpE 102 – B
Disk Drive or Hard Disk Drive
A disk drive is a randomly addressable and rewritable storage device. The term can be broadly interpreted to include optical drives and in earlier times, floppy drives. However, in popular usage, it has come to relate mainly to hard disk drives (HDDs).
Disk drives can either be housed internally within a computer or housed in a separate box that is external to the computer. They are found in PCs, servers, laptops and storage arrays, for example.
They work by rotating very rapidly around a head or heads, which read and write data.
They differ from solid state drives (SSDs), which have no moving parts and offer greater performance, but also cost more and generally offer less capacity.
History of hard disk drive
Hard disks were invented in the 1950s. They started as large disks up to 20 inches in diameter holding just a few megabytes. They were originally called "fixed disks" or "Winchesters" (a code name used for a popular IBM product). A hard disk drive consists of a motor, spindle, platters, read/write heads, actuator, frame, air filter, and electronics.
The first computer with a hard disk was IBM’s RAMAC, which was used during the 1960 Olympics to calculate sports results. A bit later, in 1962, removable disk packs were developed – a forerunner of the floppy disk. In 1964, the CRC algorithm was introduced. It provided greater security by checking and comparing data before and after it was written to the disk. In 1971, the first 8-inch diskettes came onto the market.
Evolution of Hard Disk Drives
The first hard disk drive, like so many innovations in computing, came from IBM. It was