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My multi DVD writer (LG GSA-H12L) detects on Windows but does not read or write any CD or DVD

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A whole CD or DVD? I think that's bad. – Phoshi Apr 15 '11 at 18:57
    
Is it showing status as writing in windows? Do you hear the disk spinning while writing? – dbza Jul 24 '14 at 19:19

The device could be fine (This is why windows detects it), but the laser could be malfunctioning.

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You may want to blow out the drive with compressed air, it could just be dust on the laser tip, be careful not to blow water in and do so with care.

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