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Multimedia Storage Devices


Computer Storage Magnetic Tape 1920s

1928 Magnetic Tape

Fritz Pfleumer, a German engineer, patented magnetic tape in 1928. He based his invention off Vlademar Poulsen's magnetic wire.

1930s

1932 Magnetic Drum

G. Taushek, an Austrian innovator, invented the magnetic drum in 1932. He based his invention off a discovery credited to Fritz Pfleumer.

1940s

1946 Williams Tube

Professor Fredrick C. Williams and his colleagues developed the first random access computer memory at the University of Manchester located in the United Kingdom. He used a series of electrostatic cathode-ray tubes for digital storage. A storage of 1024 bits of information was successfully implemented in 1948.

Magnetic Drum Computer Storage

Selectron Tube

In 1948, The Radio Corporation of America (RCA) developed the Selectron tube, an early form of computer memory, which resembled the Williams-Kilburn design.

1949 Delay Line Memory

The delay line memory consists of imparting an information pattern into a delay path. A closed loop forms to allow for the recirculation of information if the end of the delay path connects to the beginning through amplifying and time circuits. A delay line memory functions similar to inputting a repeating telephone number from the directory until an individual dials the number.

1950s

Magnetic Core

A magnetic core memory, also known as a ferrite-core memory, uses small magnetic rings made of ceramic to store information from the polarity to the magnetic field it contains.

1956 Hard Disk

Computer Storage Williams TubeA hard disk implements rotating platters, which stores and retrieves bits of digital information from a flat magnetic surface.

1960s

1963 Music Tape

Philips introduced the compact audio cassette in 1963. Philips originally intended to use the audio cassette for dictation machines; however, it became a popular method for distributing prerecorded music. In 1979, Sony's Walkman helped transformed the use of the audio cassette tape, which became widely used and popular.

1966 DRAM (PDF)

In 1966, Robert H. Dennard invented DRAM cells. Dynamic Random Access Memory technology (DRAM), or memory cells that contained one transistor. DRAM cells store bits of information as an electrical charge in a circuit. DRAM cells increased overall memory density.

1968 Twistor Memory

Bell Labs developed Twistor memory by wrapping magnetic tape around a wire that conducts electrical current. Bell Labs used Twistor tape between 1968 to the mid-1970s before it was totally replaced by RAM chips.

Computer Storage Selectron Tube Image 1970s

1970 Bubble Memory

In 1970, Andrew Bobeck invented the Bubble Memory, a thin magnetic film used to store one bit of data in small magnetized areas that look like bubbles. The development of the Twistor memory enabled him to create Bubble Memory.

1971 8" Floppy

IBM started its development of an inexpensive system geared towards loading microcode into the System/370 mainframes. As a result, the 8-inch floppy emerged. A floppy disk, a portable storage device made of magnetic film encased in plastic, made it easier and faster to store data.

1975 5.25" Floppy

Allan Shugart developed a the 5.25-inch floppy disk in 1976. Shugart developed a smaller floppy disk, because the 8-inch floppy was too large for standard desktop computers. The 5.25-inch floppy disk had a storage capacity of 110 kilobytes. The 5.25-inch floppy disks were a cheaper and faster alternative to its predecessor.

1980s
Computer Storage Magnetic Core Computer Storage 1956 Hard Disk Music Tape computer storage 1966 DRAM


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