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Re: Floppy stuff [was Re: What is the dd command ???]

Andrew Sackville-West wrote:
On Wed, May 03, 2006 at 12:34:59PM -0500, Mike McCarty wrote:


Be sure that one of your discs is a 720K disc, and has been degaussed.
BTW, if it Just Works on high-mu discs, even when never formatted,
then I suspect that it will ruin your 720K disc. So make sure it's
one you don't mind losing.

Agreed. though, as long as the magnetic media is intact, would not a
low-level format "Rescue" a disc? not the data, but the usability of
the disc.

Probably not. Degaussing it properly would. But once the disc
has been magnetized with hi-coercion magnetic fields, attempting
to reformat it using lo-coercion fields fails in my experience.

I know I've got some 720K discs around
somewhere, one of which I could sacrifice...

I don't have any of those :(. Further inspection also reveals that my
floppies were formatted at the factory (says right on 'em, heh). And,
after all these years of being careful with floppies, I can attest
that its not so easy as you'd think to degauss a floppy. Things I've

It only happens when you *don't* want it to happen.

tried so far:

big magnet on a 15" speaker
microwave (he he)

I'd think that would burn it up, not degauss it :-)

ac motor on my drill press
various fridge magnets wiped over the surface
holding on my monitor while degaussing the monitor


somewhere around here I have a degausser for cassette tape
heads... maybe that'll work if I can find it.

Almost certainly will "work". Those things usually have small
area effect. You need to get large areas of the disc.

Possibly just enough demagnetization to affect sector 1 of
track 0 head 0 is enough.

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