DRX500UL - External
DRU500A - Internal
<A HREF="http://www.proh.com/dvd_recorder_sony_dru-500a_drx-500ul_dvd-r_plus_drive_sales.shtml" target="_new">Check this out for more info</A>
Or do a Google search on the model numbers.
<font color=red><i>Even a broken clock is right twice a day.</i></font color=red>