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Quick Random Access
Like CDs, MDs offer instantaneous random access to the beginning of
any music track. Premastered MDs are recorded with location addresses
corresponding to each music selection.
Recordable MDs are manufactured with a “User TOC Area” to contain
the order of the music. The TOC (Table of Contents) system is similar to
the “directory management system” of floppy disks. In other words,
starting and ending addresses for all music tracks recorded on the disc are
stored in this area. This lets you randomly access the beginning of any
track as soon as you enter the track number (AMS), as well as label the
location with a track name as you would a file on a diskette.
BA
B — Music Data
A — User TOC Area
Contains the order and start/end points of the music.