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IBM turned 100 years old this week. What was the capacity of the company’s first commercially available computer with a hard disk drive?

IBM turned 100 years old this week. What was the capacity of the company’s first commercially available computer with a hard disk drive?

Available in 1956, the RAMAC 305 stored 5 MB, was the size of two large refrigerators and cost $10,000 per megabyte, according to IBM's offical history.