Re: [PCWorks] Stray EM fields, CRT's & effects Re: Burning CDs
- From: Peter Kaulback <peter@xxxxxxxxxxxxxxxxx>
- To: pcworks@xxxxxxxxxxxxx
- Date: Sat, 08 Nov 2008 20:18:44 -0500
Shielding for flash and ssd devices will evolve just as it has for hard
drives. I have an old hard drive from 1992 and it lags when sitting near
speakers or between my crt's noticeably. Yet if I put a newer drive in
the same spot there is no noticeable lag.
So crt's are being made less and less as lcd and plasma monitors gain
popularity so lesser need for shielding. As an aside, lcd's must evolve
as well as one important material in their construction will be
exhausted by 2017.
A fellow student from a while back worked on concert stage construction
and shielded each and every speaker magnet with a sheet steel box. Must
have been a lot of boxes.
Peter Kaulback
Clint Hamilton-PCWorks Admin wrote:
>> By the way, I don't know whether Energy Star
>> has to do with radiation. It has to do with
>> electricity consumption.
>
> Yes, I'm not sure it does: "In the USA, all monitors now are
> 'Energy Star' compliant which also ***might*** reduce
> radiation". I guess if you make them more efficient that
> **might possibly** reduce some of the radiation.
>
> Again, I'm mostly talking about **magnetic** fields. A CRT
> doesn't really have enough to damage a flash drive or SS HD,
> unless perhaps it's resting on top for a period of time.
> Shielding of harmful magnetic fields would have to be
> retroactive which is not possible (you can't go and shield
> every speaker or device with a large magnet in it that's
> already been purchased), so the SSD's would have to be
> manufactured with some kind of far different "shielding" than a
> monitor due to the much stronger gauss of said devices. I
> guess that would have to be some kind of "cancellation magnet"
> around them sort of like shielded speakers have......but, I've
> never tried that to see how that would work. The cancellation
> device might have to be only around the magnet itself that's
> causing the field.
>
> I've built speakers before for monitor or TV use with drivers
> that were not shielded, and I was able to shield them using
> some kind of metal. I'm not sure what it was, it was NOT
> magnetic, at least it was not drawn to magnets. It looked like
> it had zinc in it.
> -Clint
>
> God Bless
> Clint Hamilton, Owner
> http://www.OrpheusComputing.com
> http://www.ComputersCustomBuilt.com
>
> ----- Original Message -----
> From: "David Grossman"
>
>
> Right, Clint.
> That's exactly what the computer industry did with monitors.
> They shielded
> them well enough to meet the standards.
> The problem with solid state drives is different, but if they
> can solve the
> radiation problem with monitors, they can do a comparable trick
> with drives.
> By the way, I don't know whether Energy Star has to do with
> radiation. It
> has to do with electricity consumption. Radiation standards are
> based on
> TCO.
> David Grossman
>
>
>> -----Original Message-----
>
>> I agree, but they still ARE a problem. I was mostly talking
>> about magnets more than stray EM fields from electronic
>> devices, and the only way to fix that is to make products
>> shielded from them, or make products that's not sensitive to
>> them. In the USA, all monitors now are "Energy Star"
>> compliant
>> which also might reduce radiation. http://tinyurl.com/6ptk9a
>> -Clint
>
>> ----- Original Message -----
>> From: "David Grossman"
>>
>> Electromagnetic fields do not have to be a problem.
>>
>> About 20 or 25 years ago, CRTs emitted a great deal of
>> radiation, causing
>> pregnant mommies who were exposed to the radiation for many
>> hours a day to
>> spontaneously abort their babies. The fledgling computer
>> giants
>> were
>> terrified that a wonderful industry with a great future would
>> go belly up
>> (perhaps I should have used a better expression!) and they
>> were
>> determined
>> to find a solution. They did - and the resulting and
>> ever-increasing
>> Scandinavian TCO standards are so stringent today that there
>> is
>> nothing to
>> worry about. Granted, flat screens largely replaced CRTs
>> today,
>> but that's
>> not the point - and even flat screens have to comply with TCO
>> standards.
>>
>> The industry reacted and solved the problem with one kind of
>> radiation
>> because they had no choice. They proved that with
>> determination
>> it is
>> possible to practically eliminate the threat of dangerous
>> radiation.
>>
>> When it comes down to it, electromagnetic fields are just
>> another kind of
>> radiation. The industry solved the problem with CRTs, and
>> they
>> CAN solve the
>> problem with solid state media.
>>
>> It's just an issue of determination and will-power.
>>
>> David Grossman
>>
>>
>>
>>> -----Original Message-----
>>> So am I Clint, which is why I mentioned the interfaces
>>> available. If you
>>> need something portable, be it firewire or usb or e-sata
>>> then
>>> you can
>>> use an ssd.
>>>
>>> And as you stated below:
>>> "All those flash drives and media cards are sensitive to
>>> electromagnetic
>>> fields. Get too close to one, and your data is fried.
>>> That's
>>> why I use
>>> optical media, and media cards, and HD's. There's solid
>>> state
>>> HD's out
>>> now, but I think they are just like memory cards, too
>>> sensitive to EM
>>> fields."
>>>
>>> Peter Kaulback
>>>
>>> Clint Hamilton-PCWorks Admin wrote:
>>>>> As for electromagnetic fields, hard drives
>>>>> can be affected by them as well.
>>>> Sure, but we were talking about convenient **portable**
>>>> storage
>>>> methods other than optical media. ;-)
>>>> -Clint
>>>>
>>>>
>>>> ----- Original Message -----
>>>> From: "Peter Kaulback"
>>>>
>>>> Solid state drives are used in the enterprise widely, and
>>>> are
>>>> common in
>>>> the new netbooks as well. One prime factor in ssd's is
>>>> that
>>>> they are far
>>>> more shock proof than hdd's, try dropping a hard drive
>>>> and
>>>> see
>>>> how well
>>>> it works after, do the same drop with an ssd and your
>>>> data
>>>> is
>>>> safe. They
>>>> have higher average time between failure, near 1,000,000
>>>> hours.
>>>>
>>>> As for electromagnetic fields, hard drives can be
>>>> affected
>>>> by
>>>> them as
>>>> well. Put a hdd next to an electric motor and it will be
>>>> affected as it
>>>> can slow or stop altogether. The biggest problem I see
>>>> right
>>>> now is the
>>>> price, a 128gb ssd goes for over $400.00. Size for
>>>> consumers is
>>>> at about
>>>> 250 gb, in the enterprise there are 1.5tb and bigger
>>>> ssd's.
>>>>
>>>> Now some great features of ssd's are low power
>>>> consumption,
>>>> noiseless
>>>> operation due to no moving parts, error correction, and
>>>> they
>>>> can be
>>>> encrypted even when removed from their system (laptop or
>>>> desktop). Plus
>>>> they have multiple interfaces available: pcmcia, usb,
>>>> pata,
>>>> sata, etc.
>>>>
>>>> I like the idea of plugging a fast and secure drive into
>>>> the
>>>> pcmcia slot
>>>> my laptop that won't suck power or heat up too much.
>>>>
>>>> It all comes down to proper handling, one doesn't leave
>>>> cd/dvd's laying
>>>> loose on a desk or the floor, they are kept in cases or
>>>> folders
>>>> to
>>>> protect them. Leave a hard drive loose on a desk or near
>>>> crt
>>>> monitors
>>>> too long and they won't satisfy your needs, so one uses
>>>> an
>>>> enclosure of
>>>> some kind. And you don't leave a memory stick in a usb
>>>> port
>>>> all
>>>> the time
>>>> through successive reboots (though I have run one through
>>>> a
>>>> wash load
>>>> and it still works flawlessly).
>>>>
>>>> Sorry for the long winded rant ;)
>>>>
>>>> Peter Kaulback
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