'the sound of hard drives', woah.
attack vectors are only going to become more clever. the incentives get more compelling by the year.
as for my airgapped computer, i took out all connectivity like the wifi card and bluetooth stuff and put a brand new hard drive in it. it's never been anywhere near the internet and never will. of course the OS came from the internet but it can't talk to it.
i sleep well enough at night. if ninjas come around and scan me while i sleep then so be it.
as for the skeptics, sometimes these things start off at the height being theoretical, then the refinements start to arrive...
I think at some point it becomes unhealthy to worry about such far fetched situations and you may end up making a bigger mistake due high levels of stress in the process.
If you are worried about someone building patterns from the HDD noise... an SSD makes no noise that I know off since it has no moving parts.
And again if you are worried about airwave signals you can buy one of these:
Then only open your computer inside the sealed tent.
