OS X 10.6 can't mount DVD-Rs adhering to ISO 9660 (1999) ?!
in [Mac Systems]
|
Prev: black screen
Next: Snow Leopard upgrade experience
From: Alex Miller on 1 Nov 2009 18:10 Hi I recently bought a Mac and realized, to my horror, that it can't mount any of my data DVD-Rs, which were recorded using the ISO 9660:1999 format standard. Indeed, the Wikipedia seems to suggest that OS X does not support the format: http://en.wikipedia.org/wiki/ISO_9660#Operating_system_support Is there any other way to mount the disks besides using a different OS? My searching the web turned up nothing usable.
From: Geoffrey S. Mendelson on 2 Nov 2009 03:19 Alex Miller wrote: > Indeed, the Wikipedia seems to suggest that OS X does not support the > format: > http://en.wikipedia.org/wiki/ISO_9660#Operating_system_support No, what it suggests is that no one bothered to update it when Snow Leopard came out. AFAIK, it wasn't even correct, ISO9660 support was always in MacOS X from 10.0 onward. In fact, I have been reading ISO 9660 CD's using a Mac since 1991. The 1999 extensions add support for longer file names, etc, but the old format file names are also present for backwards compatiblity. > Is there any other way to mount the disks besides using a different > OS? My searching the web turned up nothing usable. More likely, your disks are not readable in the new drive due to a media incompatbility. Try reading them in another drive. Note that there are some limitations to the ISO9660 format, such as a maximum file size of 2g. There also may be problems if you did not close the sessions on the disk, i.e. left them open for further writing, or have more than one session on the disk. I've never used either, so I don't know how MacOS will handle them. Try borrowing or buying a cheap external drive and see if that works. Geoff. -- Geoffrey S. Mendelson, Jerusalem, Israel gsm(a)mendelson.com N3OWJ/4X1GM
From: Alex Miller on 2 Nov 2009 04:34 On Nov 2, 12:19 am, "Geoffrey S. Mendelson" <g...(a)mendelson.com> wrote: > More likely, your disks are not readable in the new drive due to a media > incompatbility. Try reading them in another drive. Nope. I can use "dd" to extract the raw *.iso, but I can't mount. > > Note that there are some limitations to the ISO9660 format, such as a maximum > file size of 2g. Indeed, file size might be a factor. I'm having difficulty with DVD-Rs containing a single 4.3GB file, but could read one that contains a 2.4GB file. Perhaps the limit is closer to 4GB? FWIW, I used the following under Linux to prepare the disk images: mkisofs -allow-limited-size -gui -iso-level 4 -J -joliet-long -r some_files > foo.iso
From: Alex Miller on 3 Nov 2009 01:27 On Nov 2, 2:14 pm, j...(a)cs.tu-berlin.de (Joerg Schilling) wrote: > In article <67004926-b385-4ed3-b16a-163ef761a...(a)y10g2000prg.googlegroups..com>, > Alex Miller <alex.etc.mil...(a)gmail.com> wrote: > > >Indeed, file size might be a factor. I'm having difficulty with DVD-Rs > >containing a single 4.3GB file, but could read one that contains a > >2.4GB file. Perhaps the limit is closer to 4GB? > > If you use ISO-9660 level 3 or higher, there is no file size limit. > > >FWIW, I used the following under Linux to prepare the disk images: > > >mkisofs -allow-limited-size -gui -iso-level 4 -J -joliet-long -r > >some_files > foo.iso > > You are not using mkisofs but a broken and unmaintained fork from a 5 year old > version of the original software. > > Mkisofs never hat an option called "-allow-limited-size" and there is not need > for such an option as mkisofs correclty supports large files. > > If you have problems to use the filesystems created with the broken fork, > you should not be amazed that you cannot use the resulting media. There is > a big chance that your problem is a result from one of many well known bugs > in this fork called "genisoimage". I recommend you to get the real software > from here: > > ftp://ftp.berlios.de/pub/cdrecord/alpha/ > > BTW: Since Spring 2007, mkisofs did largely extent UDF support and now > allows you to add Apple UDF extensions. This allows to have Apple extensions > on the medium without the need for creating a hybrid disk with the antique HFS > that does not even support large files >= 2 GB. Wow. I did not expect an answer from the author of mkisofs et. al. ! Debian/Ubuntu screwed up again?! I'll be more careful when burning new DVDs in the future. Is there anything I can do to read 4+ GB files from the DVDs already burned though, on this damn MacBook Pro?
From: Alex Miller on 6 Nov 2009 03:57
On Nov 3, 12:31 am, j...(a)cs.tu-berlin.de (Joerg Schilling) wrote: > In article <c1f9aa1d-0595-40ad-9afe-bf2391488...(a)y28g2000prd.googlegroups..com>, > Alex Miller <alex.etc.mil...(a)gmail.com> wrote: > > > > >On Nov 2, 2:14=A0pm, j...(a)cs.tu-berlin.de (Joerg Schilling) wrote: > >> >FWIW, I used the following under Linux to prepare the disk images: > > >> >mkisofs -allow-limited-size -gui -iso-level 4 -J -joliet-long -r > >> >some_files > foo.iso > > >> You are not using mkisofs but a broken and unmaintained fork from a 5 yea= > >r old > >> version of the original software. > >Wow. I did not expect an answer from the author of mkisofs et. al. ! > > >Debian/Ubuntu screwed up again?! I'll be more careful when burning new > >DVDs in the future. > > >Is there anything I can do to read 4+ GB files from the DVDs already > >burned though, on this damn MacBook Pro? > > If you really used exactly the command line you mentioned, these files > are not on the medium, they never have been added to the filesystem. > Debian 4 and OS X 10.6 indeed have problems reading those big files. Debian sees about 300MB of it. However, Ubuntu 8.04 can read the file fine, so it's definitely on the file system. The mkisofs used to create the image was from Ubuntu 8.04 as well. |