README.multi
上传用户:xiejiait
上传日期:2007-01-06
资源大小:881k
文件大小:4k
- Creating multi-session CD's Mini Howto FAQ
- Multi-session filesystems are a trick that comes from the Kodak photo CD.
- The OS mounts the last session that contains the sum of the current session
- and all previous sessions.
- To test (with Linux):
- Create a iso-9660 filesystem image with mkisofs-1.10 or later.
- mkisofs is included in the cdrecord release (including
- SunOS/Solaris multi-session support)
- Use the -R flag to add Rock Ridge extensions (this is important).
- Assuming that the CD-R drive is connected to target 2 on the SCSI bus.
- Write the first session with:
- cdrecord -v speed=2 dev=2,0 -eject -multi isoimage.raw
- This must be a iso9660 image with Rock Ridge extensions (see above)
- Note the number of sectors written and check the disk, it should be mountable.
- Next step is to check if cdrecord is able to retrieve the following data:
- 1) The first block (sector) number in the first track of the last session
- This must be '0' in our case.
- 2) The next writable address in the unwritten session following the current.
- This should be the number of sectors written in the first
- run + ~ 11400 sectors for about 22MB lead out/in
- To get this information type:
- cdrecord -msinfo dev=2,0
- The output should be two numbers separated by a comma.
- e.g.: 0,204562
- The first number is (1), the second number is (2).
- Create the image for the next session with mkisofs-1.12 or later.
- It is included in the cdrecord distribution.
- 2nd session:
- You should create a directory that contains a second directory with data in it
- for this purpose.
- e.g.:
- first_dir/
- second_dir/
- file_1
- file_2
- ...
- call:
- On Linux:
- mkisofs -o isoimage_2.raw -R -C xx,yy -M /dev/cdwriter_blk_dev first_dir
- On SunOS:
- mkisofs -o isoimage_2.raw -R -C xx,yy -M target,lun first_dir
- The argument of -C is the output of cdrecord -msinfo
- - On Linux, the argument of -M is a device that would allow you to mount
- the current CD in the CD-writer
- - On SunOS, target and lun refer to the SCSI target and lun of the
- CD-R device with the same notation as for cdrecord dev=xxx,yyy .
- If you want to check, whether mkisofs make evething right, you should create
- another image by using the following command line.
- On Linux:
- mkisofs -o isoimage_3.raw -R -C xx,0 -M /dev/cdwriter_blk_dev first_dir
- On SunOS:
- mkisofs -o isoimage_2.raw -R -C xx,0 -M target,lun first_dir
- You may check ***this** image by mounting it with my "fbk" on Solaris
- or the loopback driver on Linux.
- On Linux type:
- mount isoimage_3.raw -r -t iso9660 -o loop /mnt
- On SunOS type:
- mount -r -F fbk -o type=hsfs /dev/fbk0:isoimage_3.raw /mnt
- If you list /mnt, you should see all directories that have been in the first
- session and the directory "second_dir". If you try to read a file from the
- first session, you will get an I/O error or bad data (depending on the
- block address), don't worry about that. If you try to read a file from
- the secons session, you will see everything correctly.
- To write the second session to CD, call:
- cdrecord -v speed=2 dev=2,0 -eject -multi isoimage_2.raw
- If you mount this CD, you should see the first session and the second directory
- from 2nd session added to the root directory of the CD.
- Additional check:
- call:
- cdrecord -msinfo dev=2,0
- The first number should be the first writable address which was retrieved by the
- first call to cdrecord -msinfo after creating the first session.
- The second number should be the first number + number of sectors of the second session
- + ~ 11400 sectors.
- Note: The first lead-out is 1:30 (6750 sectors) the lead-in is 1:00 (4500 sectors)
- All following sessions need only 0:30 for lead-out (2250 sectors), the lead-in
- is also 1:00. So in theory, the can be 44 sessions on s 74 minute disk if you
- take into account that the minimum track size is 4 seconds.
- Joerg Schilling