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Posted by Claude on August 13, 2006, 4:15 pm
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Paul F. Dietz wrote:
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> American wrote:
>
>> No, the storage mediums are too allergic to magnetic field disturbances
>> in the solar radiation field, as well as in the vicinity of Jupiter:
>
> Utter bullshit. The magnetic fields in the interplanetary medium
> are much weaker than the magnetic field at the Earth's surface,
> let alone the magnetic field needed to affect a hard drive.
>
> Paul
Yes but what you are forgetting is particles like neutrinos and gamma
rays. They would destroy magnetic disks. They go through everything,
even the astronauts see light flashes when they close their eyes from
bombardment of the inner eye by particles. Space is a nasty place.
--
Linux is just a fancy name for Windows blocker.
Claude Hopper
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Posted by pete on August 17, 2006, 6:51 pm
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` Paul F. Dietz wrote:
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` > American wrote:
` >
` >> No, the storage mediums are too allergic to magnetic field disturbances
` >> in the solar radiation field, as well as in the vicinity of Jupiter:
` >
` > Utter bullshit. The magnetic fields in the interplanetary medium
` > are much weaker than the magnetic field at the Earth's surface,
` > let alone the magnetic field needed to affect a hard drive.
` >
` > Paul
` Yes but what you are forgetting is particles like neutrinos and gamma
` rays. They would destroy magnetic disks. They go through everything,
` even the astronauts see light flashes when they close their eyes from
` bombardment of the inner eye by particles. Space is a nasty place.
The neutrino flux in space is just so horrendously greater than at
the earth's surface, after all...
--
==========================================================================
vincent@triumf[munge].ca Pete Vincent
Disclaimer: all I know I learned from reading Usenet.
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Posted by Paul F. Dietz on August 18, 2006, 7:20 pm
Please log in for more thread options Claude wrote:
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> Paul F. Dietz wrote:
>
>>American wrote:
>>>No, the storage mediums are too allergic to magnetic field disturbances
>>>in the solar radiation field, as well as in the vicinity of Jupiter:
>>Utter bullshit. The magnetic fields in the interplanetary medium
>>are much weaker than the magnetic field at the Earth's surface,
>>let alone the magnetic field needed to affect a hard drive.
> Yes but what you are forgetting is particles like neutrinos and gamma
> rays. They would destroy magnetic disks.
I'm not 'forgeting' that, since the message I was responding to
said 'magnetic field disturbances'.
In any case, your idea is also bullshit. Neutrinos in space will be
utterly insignificant unless you're operating your hard drive
right next to a supernova (in which case neutrino damage will be
the least of your problems). As for gamma radiation doesn't damage
mangetic disks. It might affect the semiconductors in the drive
controller, but magnetic materials are highly radiation resistant.
Just what is this big source of gamma radiation you're worrying
about, btw? Cosmic radiation doses are mostly from charged particles.
Paul
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Posted by John Schilling on August 19, 2006, 2:15 pm
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>Paul F. Dietz wrote:
>> American wrote:
show/hide quoted text
>>> No, the storage mediums are too allergic to magnetic field disturbances
>>> in the solar radiation field, as well as in the vicinity of Jupiter:
show/hide quoted text
>> Utter bullshit. The magnetic fields in the interplanetary medium
>> are much weaker than the magnetic field at the Earth's surface,
>> let alone the magnetic field needed to affect a hard drive.
show/hide quoted text
>Yes but what you are forgetting is particles like neutrinos and gamma
>rays. They would destroy magnetic disks. They go through everything,
>even the astronauts see light flashes when they close their eyes from
>bombardment of the inner eye by particles. Space is a nasty place.
Yes, and I think Paul knows that better than you do.
First off, neutrinos and gamma rays are not "magnetic field disturbances",
so the idiot who said that magnetic field disturbances would knock out
hard drives in space, was dead wrong. There are magnetic fields in
space, and they do get disturbed from time to time, but the magnitude
of those disturbances is generally too small to be a problem for things
like disk drives.
Second, neutrinos and gamma rays are not problems in space. There are
not enough gamma rays in space to matter. And while there are plenty
of neutrinos in space, they don't matter either, on account of they do
not interact with matter. They will go right through an astronaut, or
a disk drive, without having the slightest effect on it. They are,
basically, ghosts. Takes a huge and very sensitive detector to, every
once in a while, actually notice that one exists.
What is a problem in space, are charged particles. High-energy charged
particles in the form of cosmic rays, and lower-energy charged particles
produced by solar storms and trapped in planetary magnetospheres. These
are not gamma rays, not neutrinos, and not magnetic field disturbances.
They are something completely different.
And while they are a danger, they are a danger that can be measured,
quantified, planned for, and dealt with. They do not prevent us from
sending people, or electronics, into deep space. In particular, they
do not prevent us from sending hard drives into deep space. In fact,
I think as far as the space radiation is concerned, hard drives are
less likely to have a problem than the competing solid-state memory
technologies, that if a hard drive suffers a radiation-induced failure
it would most likely be due to radiation effects on the solid-state
electronics of the drive controller rather than the disk itself.
Which pales in comparison to the fact that the hard drive has moving
parts built to precise tolerances, and is thus not a system you want
to send someplace a billion miles from the nearest repairman if you
can possibly help it. We can make do with solid-state memory, using
redundancy and error-correction, so that's mostly what we do.
--
*John Schilling * "Anything worth doing, *
*Member:AIAA,NRA,ACLU,SAS,LP * is worth doing for money" *
*Chief Scientist & General Partner * -13th Rule of Acquisition *
*White Elephant Research, LLC * "There is no substitute *
*schillin@spock.usc.edu * for success" *
*661-718-0955 or 661-275-6795 * -58th Rule of Acquisition *
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Posted by Mark Adler on August 24, 2006, 5:27 pm
Please log in for more thread options John Schilling wrote:
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> There are not enough gamma rays in space to matter.
Hopefully it stays that way. If one of these things
http://www.astro.psu.edu/users/nnp/grbphys.html ever goes off nearby,
pointed even a little in our direction, we'd be in deep shit.
mark
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>
>> No, the storage mediums are too allergic to magnetic field disturbances
>> in the solar radiation field, as well as in the vicinity of Jupiter:
>
> Utter bullshit. The magnetic fields in the interplanetary medium
> are much weaker than the magnetic field at the Earth's surface,
> let alone the magnetic field needed to affect a hard drive.
>
> Paul