Multiple choice technology programming languages 9) In 1956 Hard Disk Drives(HDD) were invented by which of the Following? APPLE Microsoft Western Digital IBM Reveal answer Fill a bubble to check yourself D Correct answer Explanation The first commercial hard disk drive, the IBM 350 disk storage unit, was invented by IBM in 1956 as part of the IBM 305 RAMAC system. Companies like Microsoft and Apple did not exist at the time, and Western Digital was founded later in 1970.