4 Aug
2014
4 Aug
'14
6:22 a.m.
Date: Sun, 3 Aug 2014 23:24:39 -0600
Subject: Re: An 8 Inch Disk Lathe
From: spacewar at gmail.com
To: cctalk at classiccmp.org
On Sun, Aug 3, 2014 at 10:29 PM, dwight <dkelvey at hotmail.com> wrote:
The
3D glasses I last used at the theater was circularly polarized.There seem to be two types
of 3D, one uses linearly polarized and the otherused circularly polarized. One can tell
the difference by tilting their headthe linear ones will begin to leak through the other
image and the circularones are not effected.I wonder if it requires some special fluid or
just any fluid?In any case I think one could make the entire thing automatic.Read the disk
into a image and have image recognition extract the bits.As long as the entire track
wasn't destroyed by the head it might be possibleto recover from what remains of disk
that had been trimmed by a"8 inch disk lathe".A long time ago, I recall seeing
an article about reading the disk withsomething optical. It didn't go into detail but
showed a microscopepicture to the magnetic transitions on several tracks. One could
easilysee the transitions with the method they used.Dwight
Although, not the easiest thing to do, there is a
way to
read the disk without causing the damage that heads can do.
The bit are possible to be read optically. One uses a material
like used for magnaflux.
Is there any way to use the Faraday effect to read a magnetic disk optically?