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Nero Creating a CD/DVD 37
7.3.1.2 Multisession CD for nonlinked files
If the files in the file session you wish to burn are so small that further files can
be added, and if you want to use all of the space on the CD, you can create a
Multisession CD.
By clearing the two checkboxes 'Replace files in compilation' and 'Add new files
to compilation' in the 'Options' section you will ensure that Nero will not search
for links to existing files on the CD.
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)'.
7.3.2 How are Multisession CDs structured?
This chapter explains the background to Multisession CDs and is pretty
technical – it is intended mainly for users who already have some experience of
CD burning and want to know a little more. The 'normal' user who just wants to
create a Multisession CD with Nero can skip this chapter.
The ISO file system has a very useful feature that helps us to create
Multisession CDs: The way files are stored in ISO tables of contents is that the
absolute
start block of each file and the file’s length in blocks is given. Absolute
means that all blocks in all CD tracks are numbered sequentially.
So what happens when a file’s start block belongs to a different track than the
one where the TOC you want to create is located? No problem! CD-ROM
drivers and recorders will simply read the file from another track.
CDs are written session by session and track by track, so of course only tracks
that have already been written can be addressed. This is why a reference track
must be specified first when creating Multisession ISO CDs with Nero. Nero
reads this track in and remembers the positions of the files that are on it. At the
next write session these positions are then re-written for unchanged files.
Additional Multisession information on the CD
When a new Multisession CD is started, Nero saves not just the files and folders
but also their source location on the hard disk. When a Multisession compilation
is updated, this additional information is used to automatically replace, add or
delete modified files.
Multisession CDs can still be created even if there is no additional Nero
information on the reference track. The disadvantage of this however is that the
references to the hard disk which we mentioned above will not be known to
Nero and so there can be no automatic update.
7.3.3 Background information
7.3.3.1 ISO data in XA format
Nero normally writes ISO data in the CD sector format 'Mode 1‘. However Nero
also supports the so-called 'XA format' for ISO data. The XA format is an
37


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