MassiveProng wrote:
On Thu, 12 Apr 2007 04:27:46 -0500, "Anthony Fremont"
Gave us:
MassiveProng wrote:
On Wed, 11 Apr 2007 20:55:04 -0700, John Larkin
Gave us:
This is what is being used in smart munitions now. Survives well
over 15,000 Gs.
http://www.eetimes.com/news/semi/sho...leID=198800293
I saw this in the
"For comparison, dropping a laptop produces a shock of about 2 to 4
g's. "
Where did they come up with that nonsense?
U B Idiot. A drop from 3 feet up generates about 3 to 4 G's.
Just tipping a drive over on a hard table (like one in an external case that
has 0 shock protection, like most of them have) can kill the drive by
subjecting it to hundreds of G's of impact. If it's running, it's almost a
guaranteed a head crash.
Square wave, sudden stop. A typical Hard Drive at rest can handle
40Gs.
40G's of NON-IMPACT Vibration and actually it's much more than that, more
like 500G - 1000G @ 1 or 2mS You have to be more definitive than "sudden
stop", if you reduce decel time to 0, then the number of G's is
incalculable.
Maybe by dropping it into a box
of styrofoam peanuts.
You ain't real bright.
Just dropping it a few inches on a hard surface is
many more G's than that.
You aren't very bright at all. Here's some figures for you to
utilize.
http://www.sciencebuddies.org/mentor...html?from=Home
Kids experiments? Where is the science?
More advanced:
http://www.earsc.com/HOME-Electronic...ex.asp?SID=250
Too bad you didn't seem to read/understand any of it. It's mostly about how
tiny little things like rubber grommets can do wonders to lower the force of
non-impact vibration. I double dog dare you to drop your laptop 36" onto a
concrete surface. Be sure to take pics and post them. If you think that it
will take a whole 2mS to decelerate and that your laptop will penetrate the
concrete by 1/4" or so while doing so, then who is the one that "ain't real
bright"?
For only 14,000 G's, they must have crashed their
high-speed ordinance into something fairly soft.
14k was the limit of their test gear. The munitions get more, but the
MEMs still work! They saw 100kGs likely.
It's like the collapse of a flux wave on a transformer with DC on
it. Theoretically infinite voltage is induced, but we know it is
less, and less still with loading.
A drop to a sudden stop is theoretically infinite G force, but we
know that it gets dampened and is far less, depending on the
conditions involved.
A 36" drop of a hard drive onto concrete will more than prove my point.