Hi,
I'm having a strange (at least for me) problem burning multisession
DVD+R media: the dvd becomes unreadable after the 3rd session is burned.
mount refuses to do its work, and kernel says:
Unable to identify CD-ROM format.
Note that there isn't any read error, so the kernel is simply unable to
locate the primary volume descriptor.
That happened with 3 different disks (and different data, though
sessions size were similar). DVD were burned with growisofs (5.19.4.9.7)
using the following command:
growisofs -M /dev/hdc -J -r <files> (-Z for the first session)
mkisofs version is 2.01a29.
I don't think that the problem is related to the inode wrap after 4GB
because:
* The 1st and 2nd sessions took about 2.6GB, the last was 1.8GB so
directories should be before the 4GB boundary.
* I tried the patch from Paul Serice without success.
This is the output of dvd+rw-mediainfo:
INQUIRY: [_NEC ][DVD_RW ND-1300A ][1.0A]
GET [CURRENT] CONFIGURATION:
Mounted Media: 1Bh, DVD+R
GET [CURRENT] PERFORMANCE:
Write Performance: 3.9x1385=5408KB/s@[0 -> 2295104]
Speed Descriptor#0: 00/2295104 [email protected]=10816KB/s [email protected]=5408KB/s
Speed Descriptor#1: 00/2295104 [email protected]=10816KB/s [email protected]=3245KB/s
READ DVD STRUCTURE[#0h]:
Media Book Type: A1h, DVD+R book [revision 1]
Media ID: RICOHJPN/R01
Legacy lead-out at: 2295104*2KB=4700372992
READ DISC INFORMATION:
Disc status: appendable
Number of Sessions: 4
State of Last Session: empty
"Next" Track: 4
Number of Tracks: 4
READ TRACK INFORMATION[#1]:
Track State: partial
Track Start Address: 0*2KB
Free Blocks: 0*2KB
Track Size: 899648*2KB
READ TRACK INFORMATION[#2]:
Track State: partial
Track Start Address: 901696*2KB
Free Blocks: 0*2KB
Track Size: 435648*2KB
READ TRACK INFORMATION[#3]:
Track State: partial
Track Start Address: 1339392*2KB
Free Blocks: 0*2KB
Track Size: 896000*2KB
READ TRACK INFORMATION[#4]:
Track State: blank
Track Start Address: 2237440*2KB
Next Writable Address: 2237440*2KB
Free Blocks: 57664*2KB
Track Size: 57664*2KB
FABRICATED TOC:
Track#1 : 17@0
Track#2 : 17@901696
Track#3 : 17@1339392
Track#AA : 17@2235392
Multi-session Info: #3@1339392
Same dvd, TOC dumped with cdrecord-prodvd:
WARNING: Phys disk size 2295104 differs from rzone size 899648! Prerecorded disk?
WARNING: Phys start: 196608 Phys end 2491711
first: 1 last 3
track: 1 lba: 0 ( 0) 00:02:00 adr: 1 control: 7 mode: -1
track: 2 lba: 901696 ( 3606784) -56:24:46 adr: 1 control: 7 mode: -1
track: 3 lba: 1339392 ( 5357568) -1:59:74 adr: 1 control: 7 mode: -1
track:lout lba: 2235392 ( 8941568) -1:59:74 adr: 1 control: 7 mode: -1
Note that I get similar warnings for the other DVDs.
Kernel is 2.6.6 (and 2.6.7 for the last dvd), DMA is on for both the HD
and the DVD recorder. Also I don't have any problem filling the DVD in
one session.
The "other" OS is able to read the disk, so this may be a problem in the
isofs code (that's why I put lkml on CC).
Any idea of what's going on?
thanks,
Luca
PS: cc me, I'm not subscribed.
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> I'm having a strange (at least for me) problem burning multisession
> DVD+R media: the dvd becomes unreadable after the 3rd session is burned.
I have all reasons to believe that it rather has everything to do with
position of last session, than with the exact number of sessions. I also
have all reasons to believe that it's rather ide-cd.c bug than isofs. In
other words this problem was already reported to me, but I didn't have
time to bring it up with linux-kernel people yet.
> mount refuses to do its work, and kernel says:
>
> Unable to identify CD-ROM format.
>
> Note that there isn't any read error, so the kernel is simply unable to
> locate the primary volume descriptor.
The keywords for this problem are:
> growisofs -M /dev/hdc -J -r <files> (-Z for the first session)
^^^ ide-cd.c is involved [it's no problem with sr.c
if unit is routed through ide-scsi.c]...
> This is the output of dvd+rw-mediainfo:
> ...
> Multi-session Info: #3@1339392
^^^^^^^ ... and last recorded session
starts beyond LBA #1152000, which corresponds ~2.2GB.
What's so special about 1152000 (besides that it reminds highest posible
bitrate for serial port:-) It's 256 times 60 times 75. What's so special
about these numbers? 256 is amount of interger values which can be
represented with 8-bit number, 60 is amount of seconds in minute and 75
is amount of frames in one second of CD-DA. Yes, it's about conversion
from MSF to LBA suffering from overflow around 2.2GB. In the nutshell
the problem is that drivers/ide/ide-cd.c always pull TOC in MSF format
and then attempts to convert it to LBA. If last session is recorded
beyond 1152000, isofs driver will be led by ide-cd driver to belief that
volume descriptor resides at 1152000, which in turn results in "unable
to identify CD-ROM format" message logged upon mount attempt.
As fast-acting remedy I can suggest to route your unit through ide-scsi.
The way it was under 2.4. Even though it's declared unsupported it
actually still works in 2.6 (I for one still use it). And once ide-cd.c
is fixed you'll be able to revert back to officially recommended path. A.
Il Sat, Jun 26, 2004 at 08:52:27PM +0200, Andy Polyakov ha scritto:
> *This message was transferred with a trial version of CommuniGate(tm) Pro*
> >I'm having a strange (at least for me) problem burning multisession
> >DVD+R media: the dvd becomes unreadable after the 3rd session is burned.
>
> I have all reasons to believe that it rather has everything to do with
> position of last session, than with the exact number of sessions. I also
> have all reasons to believe that it's rather ide-cd.c bug than isofs. In
> other words this problem was already reported to me, but I didn't have
> time to bring it up with linux-kernel people yet.
>
> >mount refuses to do its work, and kernel says:
> >
> >Unable to identify CD-ROM format.
> >
> >Note that there isn't any read error, so the kernel is simply unable to
> >locate the primary volume descriptor.
>
> The keywords for this problem are:
>
> >growisofs -M /dev/hdc -J -r <files> (-Z for the first session)
> ^^^ ide-cd.c is involved [it's no problem with sr.c
> if unit is routed through ide-scsi.c]...
>
> >This is the output of dvd+rw-mediainfo:
> >...
> > Multi-session Info: #3@1339392
> ^^^^^^^ ... and last recorded session
> starts beyond LBA #1152000, which corresponds ~2.2GB.
>
> What's so special about 1152000 (besides that it reminds highest posible
> bitrate for serial port:-) It's 256 times 60 times 75. What's so special
> about these numbers? 256 is amount of interger values which can be
> represented with 8-bit number, 60 is amount of seconds in minute and 75
> is amount of frames in one second of CD-DA. Yes, it's about conversion
> from MSF to LBA suffering from overflow around 2.2GB. In the nutshell
> the problem is that drivers/ide/ide-cd.c always pull TOC in MSF format
> and then attempts to convert it to LBA. If last session is recorded
> beyond 1152000, isofs driver will be led by ide-cd driver to belief that
> volume descriptor resides at 1152000, which in turn results in "unable
> to identify CD-ROM format" message logged upon mount attempt.
>
> As fast-acting remedy I can suggest to route your unit through ide-scsi.
> The way it was under 2.4. Even though it's declared unsupported it
> actually still works in 2.6 (I for one still use it). And once ide-cd.c
> is fixed you'll be able to revert back to officially recommended path.
Yes, I can confirm that with ide-scsi I can read the dvd without
problems.
Jens are you aware of this bug in ide-cd?
Luca
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