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UFO UpDates Mailing List

From: Brian Straight <brians@mdbs.com>
Date: Mon, 25 Jan 1999 09:42:19 -0500
Fwd Date: Mon, 25 Jan 1999 12:34:56 -0500
Subject: Re: UFO Communication?


>From: Rick Goldsmith <rgoldsm@synapse.net>
>To: UFO UpDates - Toronto <updates@globalserve.net>
>Subject: Re: UFO Communication?
>Date: Fri, 22 Jan 1999 23:49:26 -0500


Rick --

Here's a quote from the Minidisc page FAQ:

Recordable MD's are similar, but a pre-groove replaces the pits
and valleys and an MO coating replaces the aluminum one. When
recording, a laser is focused from one side of the disc onto the
pre-groove and heats a spot on the MO recording layer to its
Curie point while a magnetic field from a head in contact with
the other side of the disc aligns magnetic dipoles within (read
magnetizes) the heated spot on the MO layer (the N/S orientation
corresponding to 0s and 1s in the data). During playback the MD
machine focuses the laser on the pre-groove again, but at lower
power, and the data is read back by measuring changes in
polarization of light reflected from the previously magnetized
regions (the Faraday effect).

Hope this helps.

Brian