Bubble Memory

Magnetic bubble memory
Bubble memory is a sophisticated method of storing data that gets rid of the need for
moving parts such as are required in tape machines and disk drives. This type of memory
is used in large computer systems, because it allows the storage, retrieval, and
transfer of great quantities of data. The bits of data are stored as tiny magnetic fields, in
a medium that is made from magnetic film and semiconductor materials.
148 Magnetism
8-10 On recording tape, particles are magnetized in a pattern that follows
the modulating waveform.
A full description of the way bubble memory systems are made, and the way they
work, is too advanced. Bubble memory makes use of all the advantages of
magnetic data storage, as well as the favorable aspects of electronic data storage. Advantages
of electronic memory include rapid storage and recovery, and high density (a
lot of data can be put in a tiny volume of space). Advantages of magnetic memory include
nonvolatility (it can be stored for a long time without needing a constant current
source), high density and comparatively low cost.
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