Bidule0hm
Server Electronics Sorcerer
- Joined
- Aug 5, 2013
- Messages
- 3,710
I have little experience in the matter, I have two data safety things to look into after I buy my NAS: solar flare protection, and offsite backup. I will point out that Faraday cages do not have to be sealed, they can be a mesh, so the paint may not be a problem (though I am not an expert on the subject). http://en.wikipedia.org/wiki/Faraday_cage#mediaviewer/File:Cage_de_Faraday.jpg
When I originally said "EMP Bags" I was talking about something like this: , which claims it is not the same as an ordinary anti-static bag, though I have not taken the time yet to have an opinion of whether this claim is credible, the manufacturer is defending the product: http://www.amazon.com/review/R1WHNV...2PTQ8X5OEQA50&store=industrial#Mx6YXGWUFEH9NA
What would you recommend for solar flare protection? I'm truly at the start of my search and open to ideas.
There is a big difference between a hole of the size of the lid and the holes in a mesh. The size of the holes determines the minimum frequency that can pass right through the faraday cage, the bigger the hole the lower the frequency. From memory the minimum frequency is: Lambda = Hole diameter * 2 (lambda is the wavelength of the frequency) but it's maybe "* 4" instead of "* 2".
I wouldn't trust theses bags until I can test them, they look suspiciously like a simple antistatic bag...
What I recommend? well, you want a very low impedance (resistance, to simplify) material with no holes if possible. I would probably use PCB material because it's pure copper that is on a support material (so it's mechanically resistant without needing several mm of copper which would be very expensive), it's readily available and it's pretty cheap. I would simply cut the faces of the desired size box and solder them along the edges (except for the lid of course) like this for example and I would use some EMI gasket to make a good contact with the lid along the periphery.