Latitude D800 - New internal dvd r/w reads ok but won't write

I bought a used cd r/w dvd r/w internal drive to replace my cd r/w dvd r on my Dell Latitude D800 with XP Pro and SP3

An Optiarc DVD+RW AD-5540A using the Cdr4_xp.sys driver which XP says it right.

DVDs are Memorex DVD+R 16K

My computer lists it as CD Drive when i put in a blank DVD and DVD R/W Drive when it is empty.

If I look at properties when a DVD in loaded it shows empty disk as full. 

Unit works ok on all other functions.