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In 1953, IBM engineers created the first hard disk, which was the size of two refrigerators.The company then shipped the first commercial hard disk-based computer, the 5 MB IBM 305 RAMAC (random access method of accounting and control) in 1956.In 1980, IBM released the first gigabyte hard drive, which weighed 550 pounds and was the size of a refrigerator, for ,000.This was the same year Seagate introduced the first 5.25-inch hard disk.A head, similar to a phonograph arm but in a relatively fixed position, writes or reads the information on the tracks.
Memorex introduced the first IBM-compatible hard disk in 1968.
Each read or write operation requires that data be located, an operation called a .
Data already in a disk cache, however, will be located more quickly.
It was nevertheless a huge jump forward in computer storage technology, which had mostly been reliant on magnetic tape.
The movable read and write heads of RAMAC enabled semirandom access to data for the first time.A hard disk is actually a set of stacked disks, like phonograph records.