People Who Changed Computing

reynold johnson

first hard disk

Certainly one of the biggest things ever to have happened to computing was the invention of the hard disk by Reynold johnson, back in 1956.Reynold’s interest in electromechanical devices started in1933.his first invention was a device for automatically grading multiple choice tests.

Johnson joined in IBM in the 1950s,specializing in electromechanical devices.IBM during the time wanted to develop a random access memory that could store and retrieve data in seconds.Johnson and is team devised the first working magnetic disk storage in late in1955.The device named RAMAC(Random Access Method of Accounting Control ) and weighted a ton,but it was capable of accessing file in less than a second.

The first commercial hard drive in 1956 produced by IBM called the RAMAC305 had fifty 24-inch magnetic disks rotating rpm.The disk could store 5MB,which at the time was high.