The First Hard Drive Was Announced in 1956 fact

The First Hard Drive Was Announced in 1956

What Was the First Hard Disk Drive?

The engineers at IBM’s San Jose California laboratory invented the hard disk drive as early as 1953, but its first commercial use wasn’t until 1956.

An IBM press release from September 14, 1956 marks the first official announcement of the 350 disk storage.[1] Several “test RAMAC’s” were shipped in 1956 other RAMAC’s were shipped mid-1957.

The 305 RAMAC, which housed the 350 disk storage, was released alongside another very similar model the 650 RAMAC, which came with 355 disk storage. The 355 disk storage was also invented in 1953, announced in 1956, and shipped in 1957.[1]

This is the original promotional video for the 305 RAMAC.

305 RAMAC and 350 Disk Storage Specs

The 350 disk storage itself had 50 24-inch disks contained inside a cabinet and could store 5 MB of data. The 350 RAMAC’s “random access” arm could retrieve data stored on any of 50 spinning disks in less than a second.

A working model can be seen in this video.

The original 305 RAMAC or “Random Access Method of Accounting and Control” (as its design was motivated by the need for real-time accounting in business) could be housed in a room of about 9 m (30 ft.) by 15 m (50 ft.); the 350 disk storage unit measured around 1.5 square meters (16 sq ft.).[4]

Assembled with covers, the 305 RAMAC was 60 inches long, 68 inches high and 29 inches deep.[2]


Myths and Misconceptions About the First Hard Drive

Some internet meme’s claim that the hard drive was invented in 1979. This is incorrect. However the hard drive typically mentioned in these meme is notable.

IBM introduced the first hard disk drive to break the 1 GB barrier in 1980. It was called the IBM 3380 and could store 2.52 GB (500 times more than the consumer options at the time). Its cabinet was about the size of a refrigerator and the whole thing weighed 550 pounds (250 kg).[5]


The first hard disk drive, the IBM Model 350 disk storage, was invented in 1953 and announced for commercial use on September 14, 1956. Non-test models shipped in 1957. It held 5MB of data and came with the IBM 305 RAMAC system. It was released alongside another very similar model the 650 RAMAC, which came with 355 disk storage.


  1. 650 RAMAC announcement“. Retrieved Sept 29, 2015.
  2. IBM 350 disk storage unit“. Retrieved Sept 29, 2015.
  3. History of IBM Magnetic Disk Drives“. Retrieved Sept 29, 2015.
  4. IBM 305 RAMAC“. Retrieved Sept 29, 2015.
  5. Amazing facts and figures about the evolution of hard disk drives“. Retrieved Sept 29, 2015.

Author: Thomas DeMichele

Thomas DeMichele is the content creator behind,,, and other and Massive Dog properties. He also contributes to MakerDAO and other cryptocurrency-based projects. Tom's focus in all...

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