How to Create a Multi-Session Data CD

This procedure describes how to put more than one session on the CD. This procedure includes an example of copying the infoA and infoB directories onto the CD.

1. Create the file system for the first CD session.

   % mkisofs -o infoA -r -V my_infoA /data/infoA Total translation table size: 0 Total rockridge attributes bytes: 24507 Total directory bytes: 34816 Path table size(bytes): 98 Max brk space used 2e000 8929 extents written (17 Mb)

   -o infoA	Identifies the name of the ISO file system.
   -r	Creates Rock Ridge information and resets file ownerships to zero.
   -V my_infoA	Identifies a volume label to be used as the mount point by vold.
   /data/infoA	Identifies the ISO image directory to create.

2. Copy the ISO file system for the first session onto the CD.

   $ cdrw -iO infoA Initializing device...done. Writing track 1...done. done. Finalizing (Can take several minutes)...done.

   -i infoA	Identifies the name of the image file to write to the CD.
   -O	Keeps the CD open for writing.

3. Re-insert the CD after it is ejected.

4. Identify the pathname of the CD media to include in the next write session.

   % eject -n . . . cdrom0 -> /vol/dev/rdsk/c2t4d0/my_infoA

   Note the /vol/dev/... pathname.

5. Identify the next writeable address on the CD to write the next session.

   cdrw -M /cdrom Device : YAMAHA CRW8424S Firmware : Rev. 1.0d (06/10/99) Track No. |Type |Start address ----------+--------+------------- 1 |Audio |0 2 |Audio |33057 3 |Data |60887 4 |Data |68087 5 |Data |75287 Leadout |Data |84218 Last session start address: 75287 Next writable address: 91118

   Note the address in the Next writable address: output so you can provide this when you write the next session.

6. Create the next ISO file system for the next CD session and write it onto the CD.

   mkisofs -o infoB -r -C 0,91118 -M /vol/dev/rdsk/c2t4d0/my_infoA /data/infoB Total translation table size: 0 Total rockridge attributes bytes: 16602 Total directory bytes: 22528 Path table size(bytes): 86 Max brk space used 20000 97196 extents written (189 Mb)

   -o infoB	Identifies the name of the ISO file system.
   -r	Creates Rock Ridge information and resets file ownerships to zero.
   -C 0,91118	Identifies the starting address of the first session and the next writable address.
   -M /vol/dev/rdsk/c2t4d0/my_infoA	Specifies the path of the existing ISO image to be merged.
   /data/infoB	Identifies the ISO image directory to create.