Filesystem corruption (was: wiped disk - no longer bootable)

[Gene Heskett]

On Saturday 13 July 2019 11:06:27 Volker Wysk wrote:

> Zitat von Ralf Mardorf via ubuntu-users 
<ubuntu-users at lists.ubuntu.com>:
> > On Wed, 10 Jul 2019 15:30:31 +0200, Volker Wysk wrote:
> >
> > For your benefit, always pull the mains plug.
> > For the benefit of your computer, get rid of static charge.
> >
> > I didn't read this article, excepted of the quoted part, it's funny:
> >
> > "Ground Your Body
> >
> > The fastest way to get rid of static electricity in the body is to
> > let the electricity do what it wants – discharge from your body into
> > the ground. To allow this, touch any conductive material not
> > isolated from the ground such as the screw on a light switch's panel
> > or a metal streetlight pole. You can also remove your shoes and
> > socks and stand on the ground if you are outside." -
> > https://sciencing.com/rid-static-electricity-body-5862942.html
>
> Are they serious with "remove your shoes and socks and stand on the
> ground if you are outside"? The rest sound reasonable.

Since your socks are generally slightly damp, thats the best solution. 

However, and dependent on the flooring, one could develop a charge 
walking back to where you are working, so generally speaking, an 
anti-static wrist strap should be worn and clipped to the chassis of 
whatever your are working on. Those normally have a relatively large 
resistor incorporated in the lead to wrist strap connection that is 
large enough to keep you from a dangerous current thru your body should 
the other arm accidently come in contact with the high side of the line 
power should you be inattentive enough to not have unplugged it from its 
power source.

The danger level directly thru the heart muscle is usually considered to 
be 20 microamps, a current you will not feel. And it extends upward to 
about 20 milliamp's, which you will feel,  above that level the heart 
will be frozen, and will if the current is removed in a minute or two by 
some one noticing your predicament, generally start back up with a 
normal beat rhythm.

Its the "window" between 20 microamp's and 20 milliamp's thats dangerous, 
causeing fibrillation and it doesn't pump enough blood to keep you 
alive. Thats how a defibber kit and its paddles work, by slamming a huge 
charge thru the heart to freeze it for a fraction of a second and allow 
the heart to resume its normal function.

> When I want to de-charge, I touch that protection conductor of a power
> socket.
>
> Bye!

I would not bet my life on it being grounded. Depending on who wired it, 
it could even be hot. 99% of electricians are male AND nominally 30% of 
those are color-blind.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
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-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
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