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How close does a magnet have to be to erase a hard drive

post #1 of 9
Thread Starter 
so as the title states im wondering how close it has to be before you start to worry about data loss.

Im wondering because im installing speakers into the xbox laptop project in my sig and on one of them the speaker is just an inch or two from the HD. Do i need to worry about data loss or does the magnet have to be ontop of the HD before i start to worry?
post #2 of 9
It would need to be a decently powerful magnet to effect a modern hard drive.
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post #3 of 9
You'd need a hell of a magnet.
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post #4 of 9
I really doubt the magnet was strong enough to do anything.
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post #5 of 9
Thread Starter 
Ok i was just wondering one of these is for my buddys SGT and i didnt want it to be bricked when he got it overseas
post #6 of 9
Quote:
Originally Posted by racer86;13441673 
so as the title states im wondering how close it has to be before you start to worry about data loss.

Im wondering because im installing speakers into the xbox laptop project in my sig and on one of them the speaker is just an inch or two from the HD. Do i need to worry about data loss or does the magnet have to be ontop of the HD before i start to worry?

I don't think it would affect it at that distance at all. Then again, no-one can say for sure until they test this theory for themselves and over a very long period of time.
    
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post #7 of 9
The only way a regular magnet could effect a hard drive is that it could effect the arm that reads the platters, and I wouldn't think a speaker would be anywhere close enough to be able to do that (Maybe a 12" subwoofer magnet right ontop of it tongue.gif ).
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post #8 of 9
Doubt it'll do anything unless it's a damned strong one. The magnets that control the arms on the inside of the disc are some of the strongest magnets i've ever tried, for their size.
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post #9 of 9
It depends on strength and size of the magnet. A large, unshielded magnet has a lot of mass, and that creates a stronger magnetic field at distance. That is, a small hard drive magnet is strong, but only up close (doesn't induce a field at a huge range). A speaker, subwoofer, or other item with large magnet structure may potentially cause issues. However, most speaker magnets are an amalgamation of Aluminum, Nickel, and Cobalt. Others are ceramic. Some speakers have specialized neodymium magnets, which is what hard drive magnets are made from.

Still, unless it's left there for a long, long time (a couple months), directly in contact with the hard drive, then I'd think everything should be alright. In older hard drives, I have seen data corrupt arise from a relatively strong speaker magnet put on the side of the computer, near the hard drive. This was in a piece from the late 90s, however, so things will have changed.
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