Re: Multisession DVD creation problem.
- From: "Thomas Schmitt" <scdbackup gmx net>
- To: brasero-list gnome org
- Subject: Re: Multisession DVD creation problem.
- Date: Mon, 07 Jan 2019 19:38:34 +0100
Hi,
Γιώργος Κωστόπουλος wrote:
Media current: DVD+R
Media status : is written , is appendable
...
Media summary: 1 session, 2161584 data blocks, 4222m data, 257m free
Media nwa : 2163632s
Looks suitable for the next session.
Give it a try. Do not forget to import the old session before adding new
files. (Drive icon in the upper icon bar.)
Not much free space is left, though. ("257m" = 257 * 1024 * 1024 bytes)
So only a small file collection may be added.
Other than with my DVD+RW experiment, Brasero will not be able to spoil
the existing session even if it doesn't do it right.
In worst case you'd get two sessions with different file trees. The newer
one would be mounted by default and in worst case be unmountable.
For mounting the healthy old session you'd use Linux mount option
"-o sbsector=0".
The desirable case will be that the newer session shows old and new files
So there would be no need to mount the old session additionally.
------------------------------------------------------------------------
Quite technical discussion:
Joerg Schilling wrote:
DVD+R does not have the concept of "sessions" this is why I asked.
This is not true. They can have multiple tracks. As soon as a track gets
closed it becomes a session. (See MMC-5, 4.3.6.2 "Recording on DVD+R",
especially 4.3.6.2.1.3 "Sessions".)
With write-once use cases i'm nearly only using BD-R media meanwhile.
But i found a 10 year old backup DVD+R with 50 sessions (153 max):
Media current: DVD+R
Media product: RITEK/F16/49 , Ritek Corp
Media status : is written , is appendable
Media blocks : 2282864 readable , 10192 writable , 2295104 overall
TOC layout : Idx , sbsector , Size , Volume Id
ISO session : 1 , 0 , 739194s , UPDATE_HOME_2008_06_22_191945
ISO session : 2 , 741392 , 20333s , UPDATE_HOME_2008_06_25_190436
ISO session : 3 , 763936 , 19565s , UPDATE_HOME_2008_06_29_001832
ISO session : 4 , 785712 , 30291s , UPDATE_HOME_2008_06_30_220849
... more sessions ...
ISO session : 47 , 2142608 , 18932s , UPDATE_HOME_2008_11_19_180117
ISO session : 48 , 2163744 , 35100s , UPDATE_HOME_2008_11_25_102435
ISO session : 49 , 2201056 , 46953s , UPDATE_HOME_2008_11_30_201431
ISO session : 50 , 2250208 , 32503s , UPDATE_HOME_2008_12_04_190853
Media summary: 50 sessions, 2182512 data blocks, 4263m data, 19.9m free
Media nwa : 2284912s
Note that DVD+R only waste about 4 MiB between two sessions, in contrast
to DVD-R. (763936-741392 = 22544, minus 20333 payload = 2211 blocks wasted.)
With DVD-R we have a waste of 74 MiB after the fist session and 15 MiB after
each further session:
Media current: DVD-ROM
Media status : is written , is closed
Media blocks : 2294432 readable , 0 writable , 2294432 overall
TOC layout : Idx , sbsector , Size , Volume Id
ISO session : 1 , 0 , 870113s , UPDATE_HOME_2008_04_18_220030
ISO session : 2 , 908176 , 22632s , UPDATE_HOME_2008_04_20_133303
ISO session : 3 , 938656 , 19169s , UPDATE_HOME_2008_04_21_153459
... more sessions ...
ISO session : 39 , 2167648 , 23045s , UPDATE_HOME_2008_06_02_105347
ISO session : 40 , 2200592 , 23470s , UPDATE_HOME_2008_06_04_121146
ISO session : 41 , 2233968 , 60302s , UPDATE_HOME_2008_06_06_114440
Media summary: 41 sessions, 1894944 data blocks, 3701m data, 0 free
(All my drives classify the closed DVD-R by profile "DVD-ROM". That's
because they cannot do anything but DVD-ROM stuff with it.)
Both media were written by xorriso, according to the example at the end
of the man page: "Incremental backup of a few directory trees".
cdrecord -v -media-info
From our merry bug hunt with the bad power supply on forums.ubuntuusers.de
in 2015 i still have a binary of cdrecord-3.02a05.
So with my old backup DVD+R of 2008:
$ ./cdrecord-fubude-3 -v dev=/dev/sr4 -media-info
Cdrecord-ProDVD-ProBD-Clone 3.02a05-fubude-3 (x86_64-unknown-linux-gnu) Copyright (C) 1995-2015 Joerg
Schilling
TOC Type: 1 = CD-ROM
... various complaints about not being superuser ...
scsidev: '/dev/sr4'
devname: '/dev/sr4'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.9'.
cdrecord-fubude-3: Warning: using inofficial libscg transport code version
(fubude-scsi-linux-sg.c-1.96-fubude '@(#)scsi-linux-sg.c 1.96 13/05/28 Copyright 1997-2013 J. Schilling').
SCSI buffer size: 64512
atapi: 1
Device type : Removable CD-ROM
Version : 0
Response Format: 2
Capabilities :
Vendor_info : 'ASUS '
Identifikation : 'BW-16D1HT '
Revision : '1.01'
Device seems to be: Generic mmc2 DVD-R/DVD-RW/DVD-RAM.
Current: DVD+R
Profile: BD-RE
...
Profile: DVD+R (current)
...
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 LAYER_JUMP
Drive buf size : 2949120 = 2880 KB
cdrecord-fubude-3: Warning: Cannot read drive buffer.
cdrecord-fubude-3: Warning: The DMA speed test has been skipped.
Current Secsize: 2048
book type: DVD-ROM, Version (0.1)
disc size: 120mm (0)
maximum rate: Not specified (15)
number of layers:1
track path: Parallel Track Path (0)
layer type: Rewritable Area (2)
linear density: 0.267 �m/bit (0)
track density: 0.74 �m/track (0)
phys start: 196608 (0x30000)
phys end: 2491711
end layer 0: 0
bca: 0
phys size:... 2295104
Manufacturer: 'RITEK'
Media type: 'F16'
Category/Version 3A
Disk size 7A
Disk structure 5C
Recoding density 00
Manufacturer: ''
Media type: ''
Product revision 66
ADIP numbytes 83
Reference speed 57
Max speed 122
copyr prot type: 65
region mgt info: 122
Manufacturing info: ''
cpm: 0
cgms: 0
rzone size: 40
rzone number: 1
border number: 1
ljrs: 0
track mode: 7 copy: 0
damage: 0
reserved track: 0 blank: 0 incremental: 1 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: 739344
last recorded addr: 0
read compat lba: 0
Capacity Blklen/Sparesz. Format-type Type
2282864 2048 0x00 Formatted Media
Mounted media class: DVD
Mounted media type: DVD+R
Disk Is not erasable
data type: standard
disk status: incomplete/appendable
session status: empty
BG format status: none
first track: 1
number of sessions: 51
first track in last sess: 51
last track in last sess: 51
Disk Is unrestricted
Disk type: DVD, HD-DVD or BD
Track Sess Type Start Addr End Addr Size
==============================================
1 1 Data 0 739343 739344 -1
2 2 Data 741392 761887 20496 2048
3 3 Data 763936 783663 19728 2048
4 4 Data 785712 816159 30448 2048
... more sessions ...
47 47 Data 2142608 2161695 19088 2048
48 48 Data 2163744 2199007 35264 2048
49 49 Data 2201056 2248159 47104 2048
50 50 Data 2250208 2282863 32656 2048
51 51 Blank 2284912 2295103 10192 2048
Last session start address: 2250208
Last session leadout start address: 2282864
Next writable address: 2284912
Remaining writable size: 10192
As you can see, it even reports a next writable address.
With option -atip i get the same messages up to
2282864 2048 0x00 Formatted Media
there is only the unmaintained since nearly 12 years dvd+rwtools that
implements a non-standard method to emulate multi session on DVD+RW media.
growisofs is indeed unmaintained. But libburn and libisoburn learned a lot
from it. So its spirit lives on.
xorriso, too, does emulation of multi-session on overwritable media for
the special case of ISO 9660 filesystems. But i have to stress again that
DVD+R media are _not_ overwritable but rather can bear multiple sessions by
hardware, regardless of the filesystems in the sessions.
Have a nice day :)
Thomas
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