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In 1956, Thomas Watson, Jr. took over as CEO of IBM from his father who had led the company for 42 years. He kept the key slogan - THINK.
In 1957, the IBM 305 Random Access Method of Accounting and Control contained the first computer disk storage system.
The IBM System/360 was introduced in 1964 and brought with it a radical idea - businesses could purchase one system with the option to upgrade if their needs required. It came with from 8KB to 8MB of internal memory, and up to 8MB of slower Large Core Storage. A large system might have 256 KB of main storage.