[Gllug] Disk Wipe

[Andrew Halliwell]

And verily, didst Chris Bell announce to the hordes:
>    Just out of interest, and just possibly relevant, professional 2 inch
> wide videotape used a rotating head that wrote tracks almost at right angles
> to the tape. Cut editing had to be done only at specific points along the
> tape, and the track spacing had to be maintained. The tracks were made
> visible using an extremely fine grain iron powder spread over the edit point
> and viewed through a microscope. If the same technique could be used on
> discs it might not be bothered by a few light scratches, the discs are hard
> enough for me to use as mirrors.

They must be tough then 
I always thought disk platters were rather brittle (strong enough to
withstand the odd knock when encased in a drive casing, but exposed and used
as a mirror...)

Aren't you afraid of shrapnel?
:)

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