Comment 18 for bug 1458230

Success, at last!

I burnt a couple of BD-R discs, on Monday, using a USB 2 card, fitted into the problem PC, as the source external HD connection, and the rate was roughly 22 GiB in half an hour.

Here's the tail end of the output:

xorriso : UPDATE : 22408 of 22530 MB written (fifo 98%) [buf 96%] 3.3x.
xorriso : UPDATE : 22421 of 22530 MB written (fifo 99%) [buf 96%] 3.1x.
xorriso : UPDATE : 22435 of 22530 MB written (fifo 99%) [buf 96%] 3.2x.
xorriso : UPDATE : 22449 of 22530 MB written (fifo 99%) [buf 96%] 3.3x.
xorriso : UPDATE : 22463 of 22530 MB written (fifo 98%) [buf 96%] 3.3x.
xorriso : UPDATE : 22477 of 22530 MB written (fifo 83%) [buf 96%] 3.1x.
xorriso : UPDATE : 22490 of 22530 MB written (fifo 62%) [buf 90%] 3.1x.
xorriso : UPDATE : 22505 of 22530 MB written (fifo 39%) [buf 96%] 3.3x.
xorriso : UPDATE : 22519 of 22530 MB written (fifo 17%) [buf 96%] 3.3x.
xorriso : UPDATE : 22530 of 22530 MB written (fifo 0%) [buf 100%] 2.6x.
xorriso : UPDATE : Closing track/session. Working since 1732 seconds
xorriso : UPDATE : Closing track/session. Working since 1733 seconds
Writing to '/dev/sr0' completed successfully.

xorriso : NOTE : Re-assessing -outdev '/dev/sr0'
Drive current: -outdev '/dev/sr0'
Media current: BD-R sequential recording
Media status : is written , is appendable
Media summary: 1 session, 11535712 data blocks, 22.0g data, 567m free

The big difference, of course, is the fifo being loaded to 90-something percent through most of the writing.

So, I have no evidence that this was a libburn bug. Everything points to my problem's cause being inappropriate hardware (namely, a USB 1.x interface in the path to the ISO file).

Additional detail:

Cdrecord 2.01-Emulation Copyright (C) 2013 see libburnia-project.org xorriso
xorriso 1.3.2
ISO 9660 Rock Ridge filesystem manipulator and CD/DVD/BD burn program
Copyright (C) 2013, Thomas Schmitt <email address hidden>, libburnia project.
xorriso version : 1.3.2
Version timestamp : 2013.08.07.110001
Build timestamp : -none-given-
libisofs in use : 1.3.8 (min. 1.3.6)
libjte in use : 1.0.0 (min. 1.0.0)
libburn in use : 1.3.8 (min. 1.3.4)
libburn OS adapter: internal GNU/Linux SG_IO adapter sg-linux
libisoburn in use : 1.3.2 (min. 1.3.2)
Provided under GNU GPL version 2 or later.
There is NO WARRANTY, to the extent permitted by law.

$ dvd+rw-mediainfo /dev/sr0

INQUIRY: [PIONEER ][BD-RW BDR-209M][1.20]
GET [CURRENT] CONFIGURATION:
 Mounted Media: 41h, BD-R SRM
 Media ID: CMCMAG/BA5
 Current Write Speed: 8.0x4495=35960KB/s
 Write Speed #0: 8.0x4495=35960KB/s
 Write Speed #1: 6.0x4495=26970KB/s
 Write Speed #2: 4.0x4495=17980KB/s
 Write Speed #3: 2.0x4495=8990KB/s
 Speed Descriptor#0: 00/11826175 R@8.0x4495=35960KB/s W@8.0x4495=35960KB/s
 Speed Descriptor#1: 00/11826175 R@6.0x4495=26970KB/s W@6.0x4495=26970KB/s
 Speed Descriptor#2: 00/11826175 R@4.0x4495=17980KB/s W@4.0x4495=17980KB/s
 Speed Descriptor#3: 00/11826175 R@2.0x4495=8990KB/s W@2.0x4495=8990KB/s
READ DISC INFORMATION:
 Disc status: appendable
 Number of Sessions: 2
 State of Last Session: empty
 "Next" Track: 2
 Number of Tracks: 2
READ TRACK INFORMATION[#1]:
 Track State: partial incremental
 Track Start Address: 0*2KB
 Free Blocks: 0*2KB
 Track Size: 11535712*2KB
 Last Recorded Address: 11535711*2KB
READ TRACK INFORMATION[#2]:
 Track State: invisible incremental
 Track Start Address: 11535712*2KB
 Next Writable Address: 11535712*2KB
 Free Blocks: 290464*2KB
 Track Size: 290464*2KB
FABRICATED TOC:
 Track#1 : 14@0
 Track#AA : 14@11535712
 Multi-session Info: #1@0
READ CAPACITY: 11535712*2048=23625138176