The evolution of hard disk drives

The punch card

A punched card was once the basis for digital information used for computer programs and data storage. They were widely used throughout the first half of the 20th century in processing machines to input data and to store it. Punch cards could be fed into the first commercial computer, IBM 305 system, which then stored the data on hard disks

The RAMAC 305 could hold the equivalent of 64,000 punch cards

Return to Computer History Museum to highlight storage, from RAMAC to microdrives

Photo courtesy of IBM Archives.

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