burning error message

can any one tell me what this error message means plz,

error-10 at sector 800-command;2a asc;44 ascq;d9

i get this error when trying to burn dvd-r with primo dvd
on an 1800xp,windows xp pro,pioneer 105. media is datawrite gen4(v2)

i`ve used 10 discs out of the pack with no problems at all,then i get the error on the rest of the pack,ive tried burning diferent stuff but same effect and different programs.
 
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