Optical disc authoring
As Multisession-CD/DVD refers to a CD or DVD that is burned in multiple sessions (English session). Maximum of 99 sessions are possible for each medium.
Since the administration of meetings requires additional administrative data, summarizes a Multisession-CD/DVD effectively less data than a single session, so a burned in a single pass, CD / DVD. Fall for the first meeting of a Multisession-CD/DVD about 23 to 24 MB of administrative data, for each additional session about 14 to 15 MB.
Multisession CDs are used mainly for data backup and for the initial installation of PCs, because you always add in such a CD data and / or may change. Unlike a CD / DVD -RW but after an update is the space on the CD is not released and can not recover. The records are deleted only from the ISO 9660 file system of the CD. Some programs allow the treatment of a multi-session CD similar to writing to a hard disk, you can add and delete data, however, the space once described remains occupied by deletions and can not be re- used.
Compatibility
Multisession CDs are not usually used in old "stand -alone" CD and DVD players, as these devices can usually only read the first session. Newer "stand -alone" CD and DVD player and PC CD and DVD drives can play these disks easily in most cases.
Risk
If several sessions a CD-R or DVD describes, there is a danger that the entire disk can not be read, or by manually mounting an older session.