Computer hard disk drive history

Year	Event
1890	Herman Hollerith developed a method for machines to to record and store information onto punch cards to be used for the US census. He later formed the company we know as IBMtoday.
1946	Freddie Williams applies for a patent on his cathode-ray tube (CRT) storing device in December. The device that later became known as the Williams tube is capable of storing between 512 and 1024 bits of data.
1946	The Selectron tube capable of storing 256 bits of information begins development.
1950	Before using disks, storage units used magnetic drums referred to as drum machines or drum-memory computers. The first commercial drum machine was developed by the Engineering Research Associates of Minneapolis and used by the U.S. Navy ERA 110. Drum machines were used throughout the early '50s.
1956	On September 13, 1956 the IBM 305 RAMAC is the first computer to be shipped with a hard disk drive that contained 50 24-inch platters and was capable of storing 5 million characters and weighed a ton.
1959	Chucking Grinder Co. begins working on disk drives.
1961	Chucking Grinder Co. moves to Walled Lake Michigan and becomes Bryant Computer Products, a subsidiary of Ex-Cello Corp.
1961	IBM introduces the IBM 1301 disk storage unit June 2, 1961, capable of storing 28 million characters
1962	On October 11, 1962 IBM introduced the IBM 1311 disk storage drive, which stored
1973	IBM ships the 3340 Winchester hard disk drive with two spindles and a capacity of 30MB. This drive was the first drive to utilize the Winchester technology.
1980	Seagate introduces the ST506 hard disk drive, the first hard disk drive developed for microcomputers
1980	The first Gigabyte hard disk drive is introduced by IBM and weighed 550lbs with a price of $44,000.
1986	The original SCSI, SCSI-1 is developed.
1990	SCSI-2  is approved.
1996	SCSI-3 is approved.
2002	Hitachi closes deal to purchase IBM's hard disk drive operation for $2.05 billion on December 31, 2002.