Updating optical disk storage
Early optical disks were not erasable—i.e., data encoded onto their surfaces could be read but not erased or rewritten.This problem was solved in the 1990s with the development of WORM and of writable/rewritable disks.Optical storage provides greater memory capacity than magnetic storage because laser beams can be controlled and focused much more precisely than can tiny magnetic heads, thereby enabling the condensation of data into a much smaller space.An entire set of encyclopedias, for example, can be stored on a standard 12-centimetre (4.72-inch) .Are you getting ready for the move to a cloud environment?
Since then, there has been a constant succession of optical disc formats, first in CD formats, followed by a number of DVD formats.
Blu-ray discs, which are the newest type of optical media, can store up to 50 GB of data.
This storage capacity is a clear advantage over the floppy disk storage media (a magnetic media), which only has a capacity of 1.44 MB.
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