Optical Storage Mediums
Optical Storage Mediums
James Ng
The most common way of storing data in a computer is magnetic. We have hard
drives and floppy disks (soon making way to the CD-ROM), both of which can store
some amount of data. In a disk drive, a read/write head (usually a coil of
wire) passes over a spinning disk, generating an electrical current, which
defines a bit as either a 1 or a 0. There are limitations to this though, and
that is that we can only make the head so small, and the tracks and sectors so
close, before the drive starts to suffer from interference from nearby tracks
and sectors. What other option do we have to store massive amount of data? We
can use light. Light has its advantages. It is of a short wavelength, so we
can place tracks very close together, and the size of the track we use is
dependent only on one thing - the color of the light we use. An optical medium
typically involves some sort of laser, for laser light does not diverge, so we
can pinpoint it to a......
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