[ISOFS] Troubles with multi session DVDs.

[Kronos]

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 R@xxxxxxxx=10816KB/s W@xxxxxxxx=5408KB/s
 Speed Descriptor#1:    00/2295104 R@xxxxxxxx=10816KB/s W@xxxxxxxx=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.
-- 
Home: http://kronoz.cjb.net
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