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7.3
Data CD (Multisession)
7.3.1
General
If you want to create a data CD that consists of several sessions, we advise that
you create a Multisession CD. Every complete write process with Nero on a CD,
from inserting the CD you want to write to the CD being ejected, generates a
session on the CD. A session in turn contains one or more tracks. All CDs with
several sessions are 'Multisession CDs'.
There are basically two types of Multisession CD:
Multisession CD for linked files, e.g. for backups
Multisession CD for independent files
7.3.1.1
Multisession CD for linked files
Multisession CDs are advisable, say, when making a weekly Backup of a
number of folders on a CD.
When an ISO compilation is created the required folder is written to the CD in
every new session. Since only a few files may have changed, writing the entire
folder again would have the following disadvantages:
Burning would take an unnecessarily long time because redundant data are
being written each time.
Valuable CD space would be wasted as the same data is copied a number of
times.
With a CD-R, data can only be written to a CD but cannot be deleted or
changed, so the following procedure is used with Multisession CDs:
Instead of writing the unchanged data again with every session (i.e. every
backup procedure), Nero only writes cross-references to a previous CD track
which contains the unchanged file. Only the changed files are completely rewritten.
By activating the two checkboxes 'Replace files in compilation' and 'Add new
files to compilation' in the 'Options' section you will ensure that this actually
happens.
Of course when individual sessions are linked to one another there must be
some way of ensuring that the tracks (which have a definite connection to an
existing CD) are not written to another CD by mistake. This would make all files
with references outside the tracks unreadable later on! For this reason Nero
checks that the correct CD has been loaded for burning. If it hasn‘t, then the CD
that has been loaded in error is ejected.
You will find detailed information about burning Multisession CDs in the
chapters 'Creating a Multisession CD (Start))', 'Creating a Multisession CD
(Continue))' and 'Creating a Multisession CD (Finish)'.
Nero
Creating a CD/DVD • 36