Substituting DSHD for DSDD disks (or DS2D if you prefer)

[Eric Christopherson]

On Sun, Oct 25, 2015 at 3:05 PM, Eric Christopherson <
echristopherson at gmail.com> wrote:

> On Sun, Oct 25, 2015, Joseph Lang wrote:
> > 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
>

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