[Cdrtools-support] where to put the layer break on 8.5GB DVD-R DL ?

[<sk...@st...>]

Hi:

Does anybody know how to specify "where to put the layer break" while writing a large ISO image (6+ GiB) on a 8.5 GB DVD-R DL disk ?
Do we need to calculate this or is there an option that we can use so as to enable to tool to compute it by itself ?


Long Story

Have to write a 6+ GiB bootable ISO image on a DVD

Normal DVD is 4.5 GB so it cannot be used

Dual Layer DVD or DVD-R DL hold 8.5GB as they have two recordable dye layers.

I bought a Sony 8.5 GB DVD-R DL and used growisofs to write the ISO image, by issuing the following command

the device that maps to DVD writer is
# ls -l /dev/sr0
brw-rw---- 1 root optical 11, 0 Dec  4 12:50 /dev/sr0

Hence the command issued is,
# growisofs -dvd-compat -Z /dev/sr0=mybootable.iso

The DVD writing process started as usual and then stopped with an ERROR exactly when one layer (approx 4.5 GiB) was written

:-[ WRITE@LBA=1fdb40h failed with SK=3h/ASC=0Ch/ACQ=00h]: Input/output error
:-( write failed: Input/output error


The versions of the tools are as follows:

#
# growisofs -version

* growisofs by <ap...@fy...>, version 7.1,
   front-ending to mkisofs: mkisofs 3.02a07 
(x86_64-unknown-linux-gnu)


# 
# cdrecord -minfo -v

Cdrecord-ProDVD-ProBD-Clone 3.02a07 (x86_64-unknown-linux-gnu) Copyright (C) 1995-2016 Joerg Schilling
TOC Type: 1 = CD-ROM
Linux sg driver version: 3.5.36
Using libscg version 'schily-0.9'.
SCSI buffer size: 32768
No target specified, trying to find one...
Using dev=1,0,0.
atapi: 1
Device type    : Removable CD-ROM
Version        : 5
Response Format: 2
Capabilities   : 
Vendor_info    : 'MATSHITA'
Identifikation : 'DVD-RAM UJ8C2 S '
Revision       : '1.00'
Device seems to be: Generic mmc2 DVD-R/DVD-RW/DVD-RAM.
Current: DVD+R/DL
Profile: DVD-RAM 
Profile: DVD+R/DL (current)
Profile: DVD+R 
Profile: DVD+RW 
Profile: DVD-RW restricted overwrite 
Profile: DVD-RW sequential recording 
Profile: DVD-R/DL layer jump recording 
Profile: DVD-R/DL sequential recording 
Profile: DVD-R sequential recording 
Profile: DVD-ROM 
Profile: CD-RW 
Profile: CD-R 
Profile: CD-ROM 
Profile: Removable Disk 
Using generic SCSI-3/mmc-3 DVD+R driver (mmc_dvdplusr).
Driver flags   : NO-CD DVD MMC-3 SWABAUDIO BURNFREE 
Supported modes: PACKET SAO
Drive buf size : 393216 = 384 KB
cdrecord: Warning: Cannot read drive buffer.
cdrecord: Warning: The DMA speed test has been skipped.
Current Secsize: 2048
book type:       DVD+R/DL, Version (14.1)
disc size:       120mm (0)
maximum rate:    Not specified (15)
number of layers:2
track path:      Opposite Track Path (1)
layer type:      Rewritable Area (2)
linear density:  0.293 ?m/bit (1)
track density:   0.74 ?m/track (0)
phys start:      196608 (0x30000) 
phys end:        16580607
end layer 0:     2283519
bca:             0
phys size:...    16384000
layer break at:  2086912
Category/Version	E1
Disk size		0F
Disk structure		32
Recoding density	10
Manufacturer:		'MBIPG101'
Media type:		'R10'
Product revision	65
ADIP numbytes		64
Reference speed		37
Max speed		37
L0 init status:  1
L0 data areacap: 1702208
copyr prot type: 0
region mgt info: 0
cpm:             0
cgms:            0
rzone size:         40
rzone number:       1
border number:      1
ljrs:               0
track mode:         7 copy: 0
damage:             1
reserved track:     0 blank: 0 incremental: 0 fp: 0
data mode:          1
lra valid:          0
nwa valid:          0
rzone start:        0
next wr addr:       0
free blocks:        0
blocking factor:    16
rzone size:         3404416
last recorded addr: 0
read compat lba:    265696

     Capacity  Blklen/Sparesz.  Format-type  Type
      3404416             2048         0x00  No Media Present or Unknown Capacity
Mounted media class:      DVD
Mounted media type:       DVD+R/DL
Disk Is not erasable
data type:                standard
disk status:              incomplete/appendable
session status:           illegal
BG format status:         none
first track:              1
number of sessions:       1
first track in last sess: 1
last track in last sess:  1
Disk Is unrestricted
Disk type: DVD, HD-DVD or BD
Disk appl. code: 0

Track  Sess Type   Start Addr End Addr   Size
==============================================
     1     1 Data   0          3404415    3404416         -1

Last session start address:         0
Last session leadout start address: 3404416
--

Hardware information

# lshw -c disk

*-cdrom
       description: DVD-RAM writer
       product: DVD-RAM UJ8C2 S
       vendor: MATSHITA
       physical id: 0.0.0
       bus info: scsi@1:0.0.0
       logical name: /dev/cdrom
       logical name: /dev/sr0
       version: 1.00
       capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
       configuration: ansiversion=5 status=nodisc
----

Anybody explored this or faced a similar issue, please share the work around you came up with.

Thanks in advance.

warm regards
Saifi.