TRUEDISC DEVELOPER TrueDisc supports variable-rate damage-resistance, so it will use whatever disc space is left on the disc for redundancy information. Less original data == more damage-resistance.
The maximum file size for CD-R is 600MB and for DVD-R is 4.1 GB. Maximum damage recovery is currently achieved for files 80MB or less for CD-R, and 292MB or less for DVD-R. We have had very good results in our labs with files between 40% and 80% of the size of the disc.
(TrueDisc 1.0 has a maximum file size of 1.875GB; this will be removed very shortly.)