My last post close to this topic gave me more information I could imagine in
my wildest dreams. (About humans & electric conducting as well!)Thank you
everyone.

I'm curious. Lets say you have two HD's on your linux box. The secondary you
use much as a backup medium. Then you want to replace the secondary drive
while computer is on.
If you spin down a hard disk is it OK to remove it and replace while power
is on? I suppose not, but please speculate and analyze the events of hotswap
ordinary IDE disk. Would it make difference if the disk is on mobilerack or
not?
Professional electricians are welcome to join this conversation and give
your opinions!

Mr.Jason
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