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Sci.Electronics.Basics -> Replace magnetic with optical
There are 42 messages in this thread.
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Author: Bob MyersDate: 21:27 06-04-07
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Author: Paolo GaiardelliDate: 08:46 13-04-07
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Radium wrote:
> Since non-volatile flash RAM chips are not yet feasible for HDD-
> substitution, why not replace the magnetic platters with optical ones
> that use 400 nm lasers to write, read, erase, and re-write data?
>
because this procedure would likely make use of phase changes in organic
dyes, which unfortunately won't work for any reasonable number of writes.
plus you will hit the ultimate diffraction limit for the particular
wavelenght you are using, which is a major problem at the required data
density.
Unless, of course, you plan on using holograms.
> Optical platters using 400 nm lasers would surely have advantages over
> magnetic platters. More data per area and less vulnerability to
> environmental magnetic disruptions -- to name a few.
sure?
HDs are pretty well shielded.
>Too short and you increase your
> risk of cancer. So use 400 nm and dump those useless magnetic discs.
no risk of anything, the laser light is within the HD casing.
However UV light will effectively destroy the substrate.
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