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: [EMAIL PROTECTED] > ^^^^^^^ ... 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 -- Home: http://kronoz.cjb.net "Su cio` di cui non si puo` parlare e` bene tacere". Ludwig Wittgenstein -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
