Author: William H Rogers
Date: 07:58:55 09/06/02
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On September 06, 2002 at 10:17:06, Roy Eassa wrote: >On September 05, 2002 at 17:49:35, William H Rogers wrote: > >>Sarah that sounds like my sons excuse to his teachers "my dog ate my homework" >>VCR tapes and floppy disks are suppost to have a useful life of about 10 years, >>while CD's and DVD's should last about 100 years. Scratched CD's can easily be >>repaired. The surface of the CD is only a plastic coating to protect the metal >>disk that contains the information. >>Just joking about the 'dog' >>Bill > > >Aren't the pits (the data) actually in plastic, with the metal there for >reflective purposes only? No. My engineers have told me that the metal is where the data is recoreded, and that is why you can polish the surface of a damaged cd and restore its contents. I am talking about scratches, etc. By encasing the metal in plastic, the metal is kept from oxidizing and thus extending its life for years and years. Bill
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