Early History of the Hard Drive

Ramac-305

1956: IBM ships the first hard drive in the RAMAC 305 system. The drive holds 5MB of data at $10,000 a megabyte. The system is as big as two refrigerators and uses 50 24-inch platters.

1973: IBM announces the 3340, the first modern “Winchester” hard drive, which has a sealed assembly, lubricated spindles, and low-mass heads.

1983: Rodime releases the first 3.5-inch hard drive; the RO352 includes two platters and stores 10MB.

Source
Timeline: 50 Years of Hard Drives
http://www.pcworld.com/article/127105/article.html

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