Hard drive operation
Date: Around 1995
How does a computers hard drive work...store and send data? Please be as
technical as possible.
For details on this you should visit the library. There are many magazines
devoted to computers and most will have introductory articles that would
cover this type of information -- use the Reader's Guide or some other index
(ask your local librarian for help) to locate specific articles of use to
Basically, the hard drive works the same as a cassette tape. The surface of
a flat disk (a platter) is coated with a magnetic material (just like a
cassette tape). A reading and/or writing head senses or creates a magnetic
field over a very small part of the platter. Let us just discuss reading.
The reading head moves over the platter in a specific pattern. If it senses
a magnetic field it sends a "1" to the computer. If it does not sense a
magnetic field it sends a "0". The pattern of "1"s and "0"s contains the
information that the computer needs to do its work.
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Update: June 2012