BUKU SKRAP

BUKU SKRAP
EVOLUSI STORAN

KOMPUTER

NAMA : SITI SAIDAH
KELAS : 3 ARIFF

Magnetic Drum

One big step for the magnet. The first magnetic drum held 48 KB, about five
formatted .doc files.

Drum memory was originally invented by Gustav Tauschek in 1932, but magnetic
drum memory wasn’t used in computing until US Navy codebreakers developed it
during World War II. One drum was 16 inches long and held 40 tracks that spun at
12,500 revolutions per minute. Engineering Research Associates (ERA) continued
development of the technology with their Atlas project. Drum memory consisted of

a long metal cylinder coated in magnetic material, with rows of read-write heads
situated on the axis of the drum. It was once used as a primary storage device and

remained common in computing through the 50s and 60s, but is now used as an
auxiliary storage device.

Magnetic Tape Drive

Very attractive. A 1200 foot roll of tape held 230 KB of data, about 10 PDFs or 23
formatted .doc files.

Invented in Germany in 1928, magnetic tape was first used to store data in 1951 on
the Eckert-Mauchly UNIVAC I. Tape drives used motors to wind the magnetic

tape from reel to reel, while passing a tape head to read, write, or erase data. More
compact versions of this technology were common through the 1980s, like the

VHS and cassette tape. Magnetic tape is used less and less for daily backups, but
because of its inexpensive nature, it is still used for archiving data today.