Computer History IBM 305 RAMAC and 650 RAMAC, 1956 (350 Disk Storage)

Two vintage 1956 IBM films: (1) the IBM 305 RAMAC, the first commercial computer using moving-head hard disk drive for secondary storage via the IBM 350 disk unit; and (2) the IBM 650 RAMAC, which used the IBM 650 computer with an upgraded RAMAC disk drive system.
The IBM 350 Disk Unit was a major component of the IBM 305 RAMAC (Random Access Memory Accounting) system. The 305 RAMAC was introduced in September 1956.

The 305 was a vacuum-tube based computer, with magnetic drum and core, the IBM 370 Printer, IBM 323 Card Punch, IBM 380 Console, 340 Power Supply, and the IBM 350 Disk Storage Unit.
It could store about 5 million 6 bit characters, equivalent to around 4 MB of storage in today’s systems. More than 1,000 RAMAC 305s were sold from 1956 to 1961.
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** Film Two: The 650 RAMAC described in the second film is based on the IBM 650 computer of 1954, enhanced with the IBM 350 disk unit and announced as the IBM 650 RAMAC in 1956. (Films copyright by IBM.)

For more information, the following are suggested:

IBM Archives
IBM 350 Disk Storage Unit
https://www.ibm.com/ibm/history/exhibits/storage/storage_350.html

IBM 650 RAMAC Fact Sheet
https://www.ibm.com/ibm/history/exhibits/650/650_tr2.html

The Computer History Museum in Mountain View, California did a restoration of a RAMAC
https://www.computerhistory.org/groups/restorations/

IBM RAMAC Manual of Operation
http://bitsavers.trailing-edge.com/pdf/ibm/305_ramac/22-6264-1_305_RAMAC_Manual_of_Operation_Apr57.pdf

Other Educational Videos:
Computer History Archives Project
https://www.youtube.com/channel/UCOyJD0RHtF_77_oAf5tT1nQ/videos

Видео Computer History IBM 305 RAMAC and 650 RAMAC, 1956 (350 Disk Storage) канала Computer History Archives Project