Before revision: The PreMaster CD format, developed in the early 1990s by the CD-ROM division of Sony, in cooperation with "START Lab Inc." of Tokyo and Sonic Solutions, contained a hidden “PreMaster Cue Sheet” that held the metadata needed for replication that a Red Book-formatted Compact Disc lacks.
After revision: The PreMaster CD format, developed in the early 1990s by the CD-ROM division of Sony, in cooperation with "START Lab Inc." of Tokyo and Sonic Solutions, contained a hidden “PreMaster Cue Sheet” that held the metadata needed for replication that a Red Book CD-DA lacks.