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Chapter 10. Recording Advanced Formats a... > Introducing Multisession Recording

Introducing Multisession Recording

A traditional single-session data CD-ROM has only a single recording session—the disc is then fixed and closed so that it can't be recorded again. With a multisession disc, however, you can record it once, use it, then record on it again; for instance, you could record your tax returns on the same disc, “appending” them each year until you fill the entire disc.

In multisession recording, you can record separate sessions (think of them as separate volumes on the same disc), or you can “update” the same session with new information. Each session you record is separated from the previous section by an area of empty space (which can range anywhere from 14 to 30 MB, depending on its position on the disc surface). Because of this lost space, you never get the storage capacity from a multisession disc that you get from a single-session disc. It's a good idea to avoid recording a session that contains only a small amount of data, because you're guaranteed to lose at least 14 MB when you add another session!


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