I'm not surprised no one knows the answer - Hitachi seem to release the minimum of info.
http://www.hitachidigitalmedia.com/D...?productid=470
Was there not a DVD-RAM cartridge in the box?
Is the DVD-R disk you use in a caddy?
Is the caddy round or square?
And you do know, don't you, that Maxell is a brand name belonging to Hitachi - no wonder they recommend it!