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Why demagnitize an optical reader?

I've read numerous times now that folks state to demagnetize a CD or optical disc before playing it for best fidelity and accuracy.  I don't see how an optical device, which is non magnetic and made from non magnetic materials benefits from a demag process.   Does anyone have any information to support this?  Other than hype, of course.

Robert

spatialking
geoffkait's avatar
geoffkait
23,365 posts
 
Oh, geez. Here we go again.

kalali's avatar
kalali
1,977 posts
 
Are you sure you're not reading about cassette players!
georgehifi's avatar
georgehifi
10,312 posts
 
I don't see how an optical device, which is non magnetic and made from non magnetic materials benefits from a demag process. 

OhOh I feel a spurge of voodooism coming.

Correct  spatialking you cannot de-mag a aluminium substrate (CD), it's non magnetic and it's all voodoo.

You may as well go and de-magnetize all your Al-foil food wrapping or trays to make your food taste better for all the good it will do.
https://www.google.com.au/search?q=al+foil+food+trays&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjx5ZjryKzUAhVLybwKHUUaBZcQ_AUICigB&biw=1509&bih=829

Cheers George

  
geoffkait's avatar
geoffkait
23,365 posts
 
One imagines the naysayers would have a conniption if people said that demagnetizers work for interconnects, just like for CDs and vinyl, you know, given that there are no magnetizable elements in the conductors or anywhere else in the interconnects. 
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