I have one of these drives, and the stupid thing will not burn 4x on -R media.
Burns CD's and +R/RW Without a problem, but it just won't do -R at 4x. (I took the first one back, and the second one does the same thing.)
Then I wondered why nero would fail its verification, at 1x or 2x, every time. With -R.
My Pioneer DVD rom drive will not read -R media burnt with this plextor unit. Then I came across this page.
It is an update in the firmware to fix an incompatability problem in the way it writes to -R media. (no change, still won't write at 4x, still cannot read the media in the pioneer rom, still fails verification in nero.)
Anyway, I posted this info, incase anyone is having probs with the Plextor 704A
This is the Buffalo DVM-H44FB unit, that contains the plextor optics. According to the box it is made in china.