thanks adict2jane , the drive is identical to both pictures, however there is no 'centrios' markings on the drive I have. only the box it came in. the manual eject is also in the same spot. the Dvd stickers are identical as well.
in the first link, near the bottom where you see the top of the drive, where the sticker says 'aopen' that is where i find my p/n s/n there is no model # on my drive.
the sticker is identical to the picture except for the difference i just mentioned, although barley readable, you can see the aopen i was talking about on my sticker on the bottom right hand side of the white label. that is the only mention of aopen anywhere on my drive.
from this I imagine then, my drive is not a benq dw1620, but it is an aopen 1616?
fortunalty reasonsnotrules I did try and flash the drive with the latest benq from here,
however the .exe would'nt allow the flash.