I just got a dual-layer DVD burner which includes a feature identified as HD_BURN, which claims to be able to put 1.4GB on a CD blank readable in a DVD reader (any DVD reader).Is that supported by non-Windows software yet?What drive? Did you buy DVD -DL media?
Just for the record and not let people fall to wrong expectations. HD_BURN has nothing to do with Double Layer. HD_BURN was offered with single-layer units as well. HD_BURN is a hack to record double as much data on CD-R(!). It's achieved in two ways: smaller pits and different data encoding scheme. HD_BURN media can be played only in HD_BURN recorder unit and DVD units with modified(!) firmware. It won't play in "any" DVD reader.
As for Double Layer. For public reference. Upcoming dvd+rw-tools-5.20.x will support DVD+R Double Layer and pre-release versions are available for test-run upon explicit request. A.