cd/rw disk does not work on dvd drive

  gsxrrider 13:21 17 Jun 03

Can anybody help me, my pc is fitted with a dvd as standard but it wont run a copied cd/rw disk. the disk is a copied service manual for a motorbike in PDF format, it worked the first time I used it but now the drive does`nt recognise the disk. any help appreciated.

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