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Old 10-14-2005, 10:01 PM   #1
wootletootle
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Can't read multisession DVD


Hello I have a problem reading a multisession DVD+R which I just burnt.
I can see the first session but not the second.
I used growisofs (with the +M option) to burn the second session.
The second session is visible using the CDRoller utility on Windows.
Does anyone know how I might get to the data under Linux?

Thanks
Wootle.
 
Old 10-14-2005, 10:34 PM   #2
bmfan
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I might be wrong on this, but i'm pretty sure muliti session dvd burning does not work in windows or linux. you will only be able to see the first session. perhapes making a copy of the dvd would work though
 
Old 10-14-2005, 10:54 PM   #3
wootletootle
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>I might be wrong on this, but i'm pretty sure muliti session dvd burning does not work in windows or linux. you will only be >able to see the first session. perhapes making a copy of the dvd would work though

Well, yes, it does, in fact the DVD burning utility <growisofs> is specifically designed to operate in multisession.
And as I mentioned I can see both sessions with CDRoller under Windows, but not under Linux:

root@Beauty:/usr/local/src/dvd+rw-tools-5.21.4.10.8# dvd+rw-mediainfo /dev/sr1
INQUIRY: [ ][DVD+RW RW5240 ][1.19]
GET [CURRENT] CONFIGURATION:
Mounted Media: 10h, DVD-ROM
Current Write Speed: 3.1x1385=4234KB/s
Write Speed #0: 3.1x1385=4234KB/s
GET [CURRENT] PERFORMANCE:
Write Performance: 3.9x1385=5408KB/s@[0 -> 2295104]
Speed Descriptor#0: 02/2295104 R@7.8x1385=10816KB/s W@3.9x1385=5408KB/s
READ DVD STRUCTURE[#0h]:
Media Book Type: 92h, DVD+RW book [revision 2]
Legacy lead-out at: 2295104*2KB=4700372992
READ DISC INFORMATION:
Disc status: complete
Number of Sessions: 1
State of Last Session: complete
Number of Tracks: 1
READ TRACK INFORMATION[#1]:
Track State: complete
Track Start Address: 0*2KB
Free Blocks: 0*2KB
Track Size: 2295104*2KB
FABRICATED TOC:
Track#1 : 14@0
Track#AA : 14@2295104
Multi-session Info: #1@0

Only one session is detected.
 
Old 10-14-2005, 11:05 PM   #4
bmfan
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I know the program will burn it but I do not think the os will recognize anything but the first sesion. ive made multi session dvd's before under windows and linux and the OS will only see the first session
 
Old 10-14-2005, 11:19 PM   #5
wootletootle
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Yes, that's true, even multiple-session CD's are sometimes difficult to read with the native OS tools.
But there are utilities which do it, at least under Windows (CDRoller). The web page for dvd+rw-tools
suggests that it is certainly possible to read multi-session DVD's, but there are lots of ifs and buts.

Thanks for your comments.
Wootle
 
Old 10-14-2005, 11:26 PM   #6
bmfan
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im not sure but maybe if you make a copy of the dvd, youll wind up with a single sesion dvd and you will be able to get the data off it
 
Old 10-15-2005, 12:47 AM   #7
duffmckagan
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I agree with wootletootle that Multisession DVDS / CDs are readable under windows with the some additional Softwares.

But I am also the one who has not been able to read Multisession stuff under Linux.

I will take a look at that GrowISOfs when I find time.
 
Old 10-15-2005, 05:55 PM   #8
urka58
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"readcd" should do the work.
try readcd /dev/srx -fulltoc
shows you infos about
unfortunately it seems working with scsi emulation enabled only
If you need to mount a specific session
mount -t iso9660 /dev/srx /mnt/whatever -o session=x (may be 1,2....etc)
Hope this helps
Ciao
 
Old 10-15-2005, 06:02 PM   #9
duffmckagan
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Ok. I will try it when I make a multisession CD ....LOL.

But what if we don't know how many sessions are present in the Cd, can this thing show that?
 
Old 10-15-2005, 06:05 PM   #10
urka58
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one of the features of readcd is to show you what is in a cd/dvd (sessions,tracks....)
ciao
 
Old 10-17-2005, 03:40 AM   #11
wootletootle
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Thanks to all who answered. I find that I am now able to read
my multi-session DVD's. I find the most useful commands are
the dvd+rw set, in particular

dvd+rw-mediainfo /dev/srx

This shows the track information for each session and in my
case a "fabricated toc", so presumably the usual toc is missing
and that is why it fails to show up with <readcd>. dvd+rw also
gives the disk status as "appendable" and I can add more tracks
at will.

To see the DVD contents I follow urka58 and mount with the
session specified. The sessions are then seen (using "ls")
as concatenated ie

session 1
sessions 1+2
sessions 1+2+3

etc. I have to admit I don't really know what I'm doing, but the
above procedure works for the multi-session DVD's I have
burnt so far. Another suggestion is to always burn with
the following mkisofs flags

growisofs -Z /dev/srx -J -r dirtree

These are the Joliet and Rock Ridge flags. Without them filenames
will be written in 8.3 format and only 6 directory levels are permitted.

wootle
 
  


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