Re: Floppies - Actual Question

From	Robert Riches <spamtrap42@jacob21819.net>
Newsgroups	comp.os.linux.misc
Subject	Re: Floppies - Actual Question
Date	2025-09-25 00:44 +0000
Organization	none-at-all
Message-ID	<slrn10d943v.aj5.spamtrap42@one.localnet> (permalink)
References	(1 earlier) <mjhf43FjebiU1@mid.individual.net> <10b0i4g$3j4qf$10@dont-email.me> <MlVAQ.3630$9qgd.1591@fx12.iad> <10b1krp$3tbca$4@dont-email.me> <mjjf90Ftbb2U5@mid.individual.net>

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On 2025-09-25, rbowman <bowman@montana.com> wrote:
> On Wed, 24 Sep 2025 20:38:17 -0000 (UTC), Lawrence D’Oliveiro wrote:
>
>> An oscillating magnetic field, on the other hand, like you got with CRT
>> monitors, also speakers ...
>
> I was wondering what a degaussing coil would do.

Degaussing coils were intended to demagnetize the ferrous metal
pieces around a CRT.  I'd guess it would probably erase at least
some magnetic media.

When I worked at a TV station around 1980, we had a bulk tape
eraser that would do a fairly decent job on 2" wide quadaplex
tape.  With tape of that width, it was necessary to do both sides
of the reel.  The erasure wasn't complete, because the field
could not reach the middle of the tape.  It wasn't a big surprise
that the aluminum reel would not block the effect.

Remodeling the core of a large power transformer from a tube-type
TV can create a bulk tape eraser strong enough for 1/4" audio
tape.  However, I haven't used it in long enough that I don't
remember exactly where it is.

Then, there's an apocryphal story about a DEC field service guy
who put a tape in briefcase and rode the subway to the customer's
location only to find the tape unreadable.  Reportedly, putting
the briefcase on the floor of the subway got it too close to the
magnetic fields of the subway car's motors.  Reportedly, the
solution was to take a taxi rather than the subway.

HTH

-- 
Robert Riches
spamtrap42@jacob21819.net
(Yes, that is one of my email addresses.)

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Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-24 00:02 -0400
  Re: Floppies - Actual Question Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-09-24 05:06 +0000
    Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-24 05:43 +0000
      Re: Floppies - Actual Question Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-09-27 15:21 +0000
        Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-27 14:17 -0400
          Re: Floppies - Actual Question Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-09-27 22:31 +0000
            Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-28 00:26 +0000
              Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-28 01:21 +0000
              Re: Floppies - Actual Question Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-09-28 10:21 +0000
                Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-28 19:27 +0000
                Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-09-29 14:12 +0200
            Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-28 09:55 +0100
            Re: Floppies - Actual Question Richard Kettlewell <invalid@invalid.invalid> - 2025-09-28 11:08 +0100
              Re: Floppies - Actual Question Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-09-28 12:19 +0000
                Re: Floppies - Actual Question Richard Kettlewell <invalid@invalid.invalid> - 2025-09-28 15:07 +0100
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-28 15:36 +0100
                Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-28 23:35 +0000
                Re: Floppies - Actual Question Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-09-29 00:28 +0000
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-28 21:08 -0400
                Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-29 05:31 +0000
                Re: Floppies - Actual Question Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-09-29 16:32 +0000
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-29 18:36 +0100
                Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-29 19:30 +0000
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-29 10:12 +0100
                Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-29 19:33 +0000
                Re: Floppies - Actual Question candycanearter07 <candycanearter07@candycanearter07.nomail.afraid> - 2025-09-29 19:50 +0000
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-28 15:31 +0100
              Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-09-29 14:15 +0200
                Re: Floppies - Actual Question Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-09-29 08:18 -0700
                Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-29 19:27 +0000
          Re: Floppies - Actual Question Rich <rich@example.invalid> - 2025-09-28 00:31 +0000
            Re: Floppies - Actual Question Nuno Silva <nunojsilva@invalid.invalid> - 2025-09-28 11:19 +0100
              Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-28 15:22 +0100
                Re: Floppies - Actual Question Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-09-28 18:07 +0000
                Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-28 19:18 +0000
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-28 23:55 +0100
          Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-28 09:53 +0100
          Re: Floppies - Actual Question Peter 'Shaggy' Haywood <phaywood@alphalink.com.au> - 2025-10-02 18:28 +1000
            Re: Floppies - Actual Question Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2025-10-02 21:44 +0300
              Re: Floppies - Actual Question Nuno Silva <nunojsilva@invalid.invalid> - 2025-10-03 00:10 +0100
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-03 00:35 -0400
              Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-03 00:32 -0400
            Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-03 00:21 -0400
  Re: Floppies - Actual Question Andy Burns <usenet@andyburns.uk> - 2025-09-24 06:49 +0100
    Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-24 11:45 +0100
      Re: Floppies - Actual Question Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-09-24 16:53 +0000
        Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-24 14:35 -0400
        Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-24 15:05 -0400
          Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-24 21:32 -0400
        Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-24 20:38 +0000
          Re: Floppies - Actual Question rbowman <bowman@montana.com> - 2025-09-25 00:04 +0000
            Re: Floppies - Actual Question Robert Riches <spamtrap42@jacob21819.net> - 2025-09-25 00:44 +0000
              Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-24 20:58 -0400
                Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-09-25 13:07 +0200
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-25 12:48 +0100
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-25 15:52 -0400
                Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-25 22:09 +0000
              Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-25 09:44 +0100
              Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-09-25 13:04 +0200
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-25 12:48 +0100
                Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-09-25 22:15 +0200
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-25 21:06 -0400
                Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-09-25 22:10 +0000
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-25 21:09 -0400
            Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-24 20:45 -0400
              Re: Floppies - Actual Question rbowman <bowman@montana.com> - 2025-09-25 05:27 +0000
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-25 15:42 -0400
                Re: Floppies - Actual Question rbowman <bowman@montana.com> - 2025-09-26 04:59 +0000
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-26 01:36 -0400
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-27 09:12 +0100
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-27 13:58 -0400
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-27 03:11 -0400
                Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-09-29 14:22 +0200
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-29 23:03 -0400
                Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-09-30 09:32 +0200
                Re: Floppies - Actual Question Rich <rich@example.invalid> - 2025-09-26 15:19 +0000
          Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-24 20:23 -0400
            Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-09-25 09:45 +0100
  Re: Floppies - Actual Question Marco Moock <mm@dorfdsl.de> - 2025-09-24 08:41 +0200
  Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-09-24 12:04 +0200
    Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-09-24 14:34 -0400
  Re: Floppies - Actual Question John McCue <jmclnx@SPAMisBADgmail.com> - 2025-09-24 17:11 +0000
  Re: Floppies - Actual Question Daniel <me@sc1f1dan.com> - 2025-09-28 01:00 -0700

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