Archived from groups: microsoft.public.windowsxp.hardware (
More info?)
Those were interesting and well-written posts. Thank you both.
Modem Ani
"Al Dykes" <adykes@panix.com> wrote in message
news:d2efg9$n5o$1@panix5.panix.com...
> In article <gPe2e.81055$Q83.33053@bignews5.bellsouth.net>,
> John McGaw <nobody@nowh.ere> wrote:
> >Thomas Jerkins wrote:
> >> I have an external USB hard disc with a lot of backup files on it.
> >> Where should I put (or better: where should I NOT put) this external
harddisc in order
> >> be safe to not accidential delete the contents?
> >>
> >> I could imagine that e.g putting it on top of a monitor would delete
the contents because
> >> of the magnetic field of the monitor.
> >>
> >> What about TVs or magnetic transformator for halogen lamps or laser
printers?
> >>
> >> What distance from these devices is safe?
> >>
> >> Tom
> >>
> >Put is someplace dry and cool and where it is safe from being knocked
> >about. I would worry very little about external magnetic fields unless I
> >was intending to place it inside an operating MRI machine or degaussing
> >device. The fields emitted by normal household or office equipment are
> >weak enough that the field that actually penetrates to the inside of a
> >drive is not enough to make any difference. If you don't believe me,
> >find a dead drive and disassemble it -- inside you will find some of the
> >strongest permanent magnets that you are likely to come across. If these
> >magnets do no harm to the data being literally inside the drive the weak
> >field from an external source isn't likely to matter.
> >--
> >John McGaw
> >[Knoxville, TN, USA]
> >http://johnmcgaw.com
>
>
> Agreed. If you look at the specs for the strenght of the field
> necessary to write on a modern disk (gauss-oerstads is une unit of
> measure) you'd find it's thousands of times stronger than the earth's
> magnetic field and is you walked by a a device that made such a field
> it would pull your belt buckle, watchband or anything else made of a
> magnetic material. Iron objects in the vicinity become flying hazards
> when a magnet this powerfull is energized. The only magnets outsine
> laboratories anywhere near powerfull enough to affect a disk drive are
> MRI machines. See the third page here, for hazards;
>
http://www.mbi.ufl.edu/facilities/amris/safety.pdf
>
>
> The disk drive has an electromagnet that's as powerfull as an MRI
> machine. The reason you don't notice is that it's litterally
> microscopic and the field is effective over distances measured in
> millions of an inch before it falls off.
> --
> a d y k e s @ p a n i x . c o m
>
> Don't blame me. I voted for Gore.
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