Trouble burning 7919 MB to DVD+R DL media

vbimport

#1

When I try to burn 7919 MB worth of data to a Verbatim DVD+R DL (8.5 GB) single sided disc my Samsung TS-H552U drive ejects the media and I find the following error in my NeroHistory.log: Not enough free discspace. (Medium in drive: DVD+R DL. Medium required by compilation: DVD+R/RW, DVD-R/RW, DVD+R DL.). A bit further up in the log I also noticed this message:
06:44:53 PM #4 Text 0 File DlgWaitCD.cpp, Line 269
Last possible write address on media: 4173823 (927:30.73, 8151MB)
Last address to be written: 4465439 (992:19.14, 8721MB)

Does this mean that the 7919 MB ends up being treated as 8721MB? If so, why?

Thanks in advance

Larger excerpt from the NeroHistory.log:

Using interface version: 6.6.0.12
Installed in: /usr/share/nero
Application: Ahead Software AG\NeroLINUX
Internal Version: 6, 6, 0, 15e

Recorder: <TSSTcorp CD/DVDW TS-H552U>Version: US03 - HA 0 TA 0 - 0.0.0.0
Adapter driver: <ide-cdrom> HA 0
Drive buffer : 2048kB
Bus Type : default (0) -> ATAPI, detected: ?
Excluded drive IDs:
WriteBufferSize: 83886080 (0) Byte
ShowDrvBufStat : 0
BUFE : 0
Physical memory : 2008MB (2056220kB)
Free physical memory: 28MB (29484kB)
Memory in use : 98 %
Uncached PFiles: 0x0
Use Inquiry : 1
Global Bus Type: default (0)
Check supported media : Disabled (0)

20.7.2005
NeroAPI
03:41:10 PM #1 Text 0 File Reader.cpp, Line 127
Reader running

03:41:10 PM #2 ISO9660GEN -11 File Geniso.cpp, Line 3309
First writeable address = 0 (0x00000000)

06:38:50 PM #3 Text 0 File Burncd.cpp, Line 3233
Turn on Disc-At-Once, using DVD media

06:44:53 PM #4 Text 0 File DlgWaitCD.cpp, Line 269
Last possible write address on media: 4173823 (927:30.73, 8151MB)
Last address to be written: 4465439 (992:19.14, 8721MB)

06:44:53 PM #5 Text 0 File DlgWaitCD.cpp, Line 281
Write in overburning mode: NO

06:44:53 PM #6 Text 0 File DlgWaitCD.cpp, Line 2452
Recorder: TSSTcorp CD/DVDW TS-H552U
Medium not present

06:44:53 PM #7 Text 0 File DlgWaitCD.cpp, Line 447
>>> Protocol of DlgWaitCD activities: <<<
=========================================
Not enough free discspace.
(Medium in drive: DVD+R DL. Medium required by compilation: DVD+R/RW, DVD-R/RW, DVD+R DL.)