README.session
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- # $Id: README.session,v 1.4 1999/03/02 04:16:40 eric Exp $
- This release of mkisofs has basic support completed for
- multiple sessions. However, we still need some interaction
- between cdrecord and mkisofs for this to work correctly. This is needed as
- only cdrecord knows the different ways to gather these numbers for all
- different drives. It may be that future versions of mkisofs will include
- the needed support for MMC compliant drives.
- There are a few new options to mkisofs to allow for this.
- The first one is "-M /dev/scd0", and is used so that mkisofs can examine
- the entirety of the previous image so that it can figure out what additional
- files need to be written in the new session. Note that there are operating
- systems that don't allow to read from CD drives with a sector size
- of 2048 bytes per sector. To use mkisofs on such an operating system, you
- will need a version of mkisofs that includes the SCSI transport library
- from cdrecord. Simply use the dev= syntax from cdrecord with -M in
- such a case. It will tell mkisofs to use the SCSI transport library to
- read from the CD instead of using the standard read() OS interface.
- There is also a temporary hack in mkisofs in the form of a '-C' option.
- The -C option takes two numbers as input, which are delimited by commas.
- For example, you could specify "-C 1000,1020", but you should never just
- make up numbers to use here. These numbers are determined from cdrecord.
- Note that if you use -C and omit -M, it effectively means that
- you are writing a new session, starting at a non-zero block number,
- and you are effectively ignoring all of the previous session contents.
- When this session is sent to the writer, the new session effectively
- "erases" the previous session.
- In practice you should be able to do something like:
- mkisofs [other options] -C `cdrecord dev=b,t,l -msinfo`
- -M /dev/cdblkdev
- Replace 'b,t,l' by the aproriate numbers for SCSIbus, target and lun
- of your drive.
- Note: As of the 1.12b5 release, the multi-session technology has
- matured quite significantly. It is entirely possible that bugs
- exists, or that further tweaks will be required somewhere along the
- way to get things working correctly. The data gathering mode of
- cdrecord has been tested, and I believe it works correctly. Caveat
- Emptor.
- [Mar 1, 1999].