Hi, Thank your for the answers, and sorry I've been a while in responding.
I am preparing more data for back-up, and my plan is to reinstate my Windows XP partition and investigate Blue-ray BD-R burning behaviour with (probably) CDBurnerXP. I agree that the evidence suggest that Defect Management is a necessary condition for the problem, but, as you said, it should not be having an order of magnitude effect on the writing speed. If my experience is similar, in XP, I will buy a different brand of BD-R, and, if that makes little difference, try to reject the drive. Summarising all “experiments” so far: 1) K3b 2) growisofs -Z /dev/sr0=disc02.iso 3) growisofs -speed=20 -Z /dev/sr0=disc03.iso 4) cdrskin dev=/dev/sr0 -v padsize=300k blank=format_if_needed -multi disc04.iso 5) cdrskin dev=/dev/sr0 -v -v padsize=300k gracetime=60 blank=format_if_needed speed=10 --adjust_speed_to_drive -multi disc05.iso 6) xorrecord -v dev=/dev/sr0 speed=26970k fs=8m -multi --grow_overwriteable_iso blank=as_needed padsize=300k disc06.iso 1) K3b Mounted Media: 41h, BD-R SRM Speed Descriptor#0: 00/12219391 [email protected]=53940KB/s [email protected]=53940KB/s Disc status: complete Media current: BD-R sequential recording Media status : is written , is closed Media summary: 1 session, 11797440 data blocks, 22.5g data, 0 free Format status: written, with 23866.0 MiB BD Spare Area: 0 blocks consumed, 0 blocks available 2) growisofs -Z /dev/sr0=disc02.iso 3) growisofs -speed=20 -Z /dev/sr0=disc03.iso Mounted Media: 41h, BD-R SRM+POW Speed Descriptor#0: 00/12088319 [email protected]=53940KB/s [email protected]=53940KB/s POW RESOURCES INFORMATION: Remaining Replacements:16843296 Remaining Map Entries: 0 Remaining Updates: 0 Media current: BD-R sequential recording Media status : is written , is appendable Media summary: 1 session, 12088320 data blocks, 23.1g data, 568m free Format status: written, with 23610.0 MiB BD Spare Area: 0 blocks consumed, 65536 blocks available 4) cdrskin dev=/dev/sr0 -v padsize=300k blank=format_if_needed -multi disc04.iso 5) cdrskin dev=/dev/sr0 -v -v padsize=300k gracetime=60 blank=format_if_needed speed=10 --adjust_speed_to_drive -multi disc05.iso Mounted Media: 41h, BD-R SRM Speed Descriptor#0: 00/11826175 [email protected]=53940KB/s [email protected]=53940KB/s Media current: BD-R sequential recording Media status : is written , is appendable Media summary: 1 session, 11797440 data blocks, 22.5g data, 56.1m free Format status: written, with 23098.0 MiB BD Spare Area: 0 blocks consumed, 196608 blocks available 6) xorrecord -v dev=/dev/sr0 speed=26970k fs=8m -multi --grow_overwriteable_iso blank=as_needed padsize=300k disc06.iso Exactly as 4) & 5), except for reflecting that a smaller ISO was written to 6). I am attaching an archive of the direct “dvd+rw-mediainfo /dev/sr0” and “xorriso -outdev /dev/sr0 -list_formats” output for each disc. ** Attachment added: "Archive of results from dvd+rw-mediainfo and xorriso -list_formats" https://bugs.launchpad.net/ubuntu/+source/libburn/+bug/1458230/+attachment/4407275/+files/BD-Details.tar.xz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1458230 Title: libburn imposing 0.2x BD-R burn (5-6 hours) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libburn/+bug/1458230/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
