Your M35X-S1143 model - assuming it still has the stock drive - has an DVD / CD-RW optical drive - i.e. it will write only to CD's but not DVD's. If you try to burn a DVD, it'll tell you that the disc is write protected (when in fact, the drive doesn't even know how to write to a DVD disc.); if you go ahead and burn a CD, you will not encounter the write protection warnings.
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