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.
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Nero Burning ROM (Shareware)
Nero is the best and most complete DVDR / CDR / Blu-ray all-in-one software