Who invented the hard disk drive ?

A hard disk (also known as HD or HDD) drive is
common data storage for computers.
Hard disks use magnets to store information.
The hard disk was invented on September 13,1956 by IBM team led by Rey Johnson
(considered as "father" of the disk drive).
Earlier hard disk drives were large and cumbersome devices. A 5 or 20 megabyte harddisk capacity was considered large in early 70
and 80's.
The commercial usage of hard disk drives
began in 1956 with the shipment of an IBM
305 RAMAC system including IBM Model
350 disk storage .
1980 - The world's first gigabyte-capacity disk
drive, the IBM 3380, was the size of a refrigerator, weighed 550 pounds (250 kg), and had a price tag of US $40,000.