Comment 10 for bug 1458230

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 R@12.0x4495=53940KB/s W@12.0x4495=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 R@12.0x4495=53940KB/s W@12.0x4495=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 R@12.0x4495=53940KB/s W@12.0x4495=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.