25 Oct
2015
25 Oct
'15
9:19 p.m.
On Sun, Oct 25, 2015 at 3:05 PM, Eric Christopherson <
echristopherson at gmail.com> wrote:
On Sun, Oct 25, 2015, Joseph Lang wrote:
Also, do I always need to cover one hole on a 3.5" HD disk when using it in
an HD-capable drive? Or does the disk or the OS notice it's been formatted
as DD and then treat it accordingly?
--
Eric Christopherson
This list seems to me to be populated with
"build your own" types, so
make your own degausser.
Decades ago I repaired the tape eraser at the TV
station I worked at.
Once I saw how it was built I built my own. Take a transformer
(something
about 100 watt or more) pull the laminations out (the hard part) line up
all the 'E's put them back. Discard the 'I's.
It will buzz like mad and get hot in a minute but
produce a very strong
AC magnetic field.
Keep it away from your shadow mask color TV!
Joe
> On Oct 25, 2015, at 1:01 AM, Chuck Guzis <cclist at sydex.com> wrote:
>
> On 10/24/2015 09:06 PM, Eric Christopherson wrote:
>
>
>> Fascinating -- I didn't know there were AC and DC magnetic fields.
>> How strong is "very strong", and would the library device I mentioned
>> count toward "an AC erase"? Should I assume that just doing an AC
>> erase would be insufficient?
I guess my last question (would doing just an AC erase, by whatever
means, always be insufficient) got lost.
>
> The AC unit I use is a VHS tape bulk eraser. It's pretty strong and
has
a limited working time--maybe 2-3 minutes before the thermal cutout
interrupts. Let it cool for a few minutes and get back to work.
>
> How strong a DC erase? I suppose that one of these magnets could well
lift a
100 lbs. Scary strong.
>
> --Chuck
>
--
Eric Christopherson