On September 4, 1956, The IBM 350 Disk Storage Unit Model 1 was announced, which was the first commercial storage unit to use magnetic disk storage, the technology behind hard disk drives. About the size of two refrigerators and weighing in at one ton, the 350 could store about 4 – 5 megabytes, depending on how it was calculated.
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September 4: First Commercial Hard Drive
September 4, 2021