Compare the way data is stored and retrieved in a magnetic disk and a cd-rom
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In a CD ROM, data is stored using binary form. In technical language there are certain patterns which are analyzed by the CD ROM, which appears on the disk itself. That is how its read and stored.
In the case of a magnetic disk it also stored data by making use of binary form, i.e. 1 and 0's. However it doesn't use laser, it uses magnetic fields to store the data. Its stored in tiny magnetic patterns.
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