Terrific - i'll keep my eyes open for any revisions. Thank you. Incidentally, I just burnt a dual-layer dvd+r in imgburn and used the change booktype (NEC) option.
After burning, in read mode, the information includes the following:
Physical Format Information (Last Recorded):
Disc ID: RICOHJPN-D01-67
Book Type: DVD-ROM
So, if i understand correctly, imgburn has changed the bitsetting under the original unmodified firmware, which i didn't think was possible.
And if i try to use the change booktype option for a single layer dvd+r, it fails "Reason: parameter value invalid"
So i'm a bit confused all round ??