The IBM 305 RAMAC (Random Access Method of Accounting and Control) is a significant and pioneering computer system introduced by IBM in 1956. It is most famous for being the first computer to use a hard disk drive (HDD) for storing data. The RAMAC system included a disk storage unit known as the IBM 350, which could store up to 5 megabytes of data on 50 disks, each rotating at a speed of 1,200 RPM.
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