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Can magnets screw up or erase DVDs?


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#1 of 11 StephenA

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Posted January 30 2002 - 08:12 AM

Earlier while watching Shrek, I was cleaning the area I was sitting at. Not thinking, I put a magnet on the case, which had the second disc in it. I quckly realized what I did, and took it off. I put the disc in my player, and it started out ok. I'll have to check it thouroughly later. I hope I didn't do anything to screw it up.

#2 of 11 Brian Kidd

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Posted January 30 2002 - 08:13 AM

DVDs are optical, mot magnetic, media. You have nothing to worry about. Now, if you try that with a videotape, you're up a creek.
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#3 of 11 Tony_Faville

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Posted January 30 2002 - 08:13 AM

Uh, no..... DVD's are laser/light based, a magnet will not affect them.

#4 of 11 StephenA

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Posted January 30 2002 - 08:17 AM

Ok, thanks. I just wanted to make sure. Better to be safe than sorry.

#5 of 11 Julie K

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Posted January 30 2002 - 08:19 AM

Just don't drop a big one on your DVD Posted Image
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#6 of 11 Horatio Jones

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Posted January 30 2002 - 08:28 AM

indeed don't drop one Posted Image

#7 of 11 Eric Huffstutler

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Posted January 30 2002 - 09:00 AM

DVD's are like music CD's and manufactured much the same way. The data is "pressed" into a metallic layer, not magnetically recorded like tapes or floppy discs so there is no way to erase the information. No more so than erasing a vinyl 45rpm record (you do remember them don't you) Posted Image

#8 of 11 Nick_Scott

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Posted January 30 2002 - 09:21 AM

_____________________________________________
...so there is no way to erase information..
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On a related note:
My DVD players manual (RC5231z) says do NOT put
CD-R, or DVD-R discs into the player. It will
erase the information.

#9 of 11 Kwang Suh

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Posted January 30 2002 - 09:29 AM

If you hit your DVD with a magnet, then you could have a problem Posted Image

#10 of 11 Julie K

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Posted January 30 2002 - 09:43 AM

Ways to destroy a DVD with a magnet:

Drop 500 pound magnet onto DVD.
Pour sand onto DVD surface and rub magnet across it - "erasing" the disc.
Tie string around magnet. Attach to hole in DVD to use as weight in a jar of hydrochloric acid.
Melt magnet and shape into bullet. Fire from large caliber rifle at DVD.
"I have the heart of a child. I keep it in a jar on my shelf."
"The power of accurate observation is frequently called cynicism by those who don't have it."

#11 of 11 Dennis Nicholls

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Posted January 30 2002 - 11:19 AM

Actually if you melted a magnet and formed it into a bullet, most likely the magnetism would cease due to the domains realigning due to the great heat. However it would still blow holes in a DVD. Posted Image

Actually if you got a really big magnet (think physics particle accelerators) and ran a DVD past it, the eddy currents may deform the metal layer within the DVD. One of my crazier physics profs working at SLAC once put his head through a large magnet there and said he "saw" strange colors.... Posted Image

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