description IBM 350 Disk Storage Unit Overview
The IBM 350 Disk Storage Unit represents a pivotal moment in computing history. Introduced in 1956, it was the world’s first commercially available hard disk drive. Featuring fifty rotating platters, this unit provided approximately five megabytes of storage capacity – a substantial amount for its time. It served as foundational technology for mainframe computers and early data processing systems, primarily used by businesses and government agencies needing reliable data storage solutions.
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IBM 350 Disk Storage Unit ranks #43 of 113 in the Artifact ranking, behind Amiga 500, ahead of Etch A Sketch.
help IBM 350 Disk Storage Unit FAQ
How much data could the IBM 350 Disk Storage Unit actually hold?
Introduced in 1956, the IBM 350 offered a storage capacity of approximately five megabytes. While this is infinitesimally small by modern standards, it was a massive leap forward at the time and capable of holding roughly 64,000 standard punch cards worth of information.
How physically large was the IBM 350 hard disk drive?
The entire unit was the size of a large commercial refrigerator, standing roughly five feet tall and six feet wide. It weighed over a ton and required a dedicated, air-conditioned room due to the immense heat generated by its internal mechanics.
How did the read/write mechanism function on the IBM 350?
The device utilized a stack of fifty large magnetic disks, measuring two feet in diameter, which spun continuously at 1,200 RPM. Data was read and written by a pair of pneumatically controlled access arms that moved rapidly in and out between the spinning platters.
Which computer system was the IBM 350 associated with?
The IBM 350 Disk Storage Unit was the primary storage component of the IBM RAMAC 305 computer system. This integration marked the first time a computer allowed random access to data, revolutionizing how businesses managed accounting and payroll.
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