19. A device invented by Dr. Bobeck in 1966, for mass storage of data is A.Punched paper tape B.Magnetic bubble storage C.Magnetic tape D.Magnetic disk E.None of the above
Option B Solution: Magnetic bubble storage : Bubble memory is a type of non-volatile computer memory that uses a thin film of a magnetic material to hold small magnetized areas, known as bubbles or domains, each storing one bit of data. The material is arranged to form a series of parallel tracks that the bubbles can move along under the action of an external magnetic field.
