The term Multisession, when used in reference to optical disc recording, describes a disc with more than one data session. Optical disc data is laid out in sessions which contain lead-in and lead-out information. Each session must include at least one track to comply with specifications, and there is a limit of 99 tracks per session. Multisession compilations are often created on write-once recordable media, allowing additional data to be added to the disc later on.
Using software solutions such as Nero Burning Rom, at-home users can create audio CD or CD-ROM data CD compilations. While a CD-R is not re-writable, several sessions of data can be burned to the disc at separate times. This type of disc is known as a multisession disc.
