FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Informed by Jacob Rabinow’s ideas at NBS, IBM developed and shipped the first commercial Hard Disk Drive (HDD), the Model 350 disk storage unit, to Zellerbach Paper, San Francisco in June 1956 as part of the IBM 305 RAMAC (Random Access Method of Accounting and Control) system.

Detailed explanation-2: -The IBM 305 RAMAC was the first commercial computer that used a moving-head hard disk drive (magnetic disk storage) for secondary storage. The system was publicly announced on September 14, 1956, with test units already installed at the U.S. Navy and at private corporations.

Detailed explanation-3: -The hard disk was created in 1953 by engineers at IBM who wanted to find a way to provide random access to high capacities of data at a low cost. The disk drives developed were the size of refrigerators, could store 3.75 MB of data and began shipping in 1956.

Detailed explanation-4: -The commercial usage of hard disk drives (HDD) began in 1957, with the shipment of a production IBM 305 RAMAC system including IBM Model 350 disk storage. US Patent 3, 503, 060 issued March 24, 1970, and arising from the IBM RAMAC program is generally considered to be the fundamental patent for disk drives.

Detailed explanation-5: -The IBM 62PC (Piccolo) 65MB capacity drive introduced in 1979 used six 8-inch disks with one surface dedicated to servo position data.