Frames are arranged in sectors, which contain 98 frames each. The subcode bytes of the first two frames of a sector are used as two synchronization words. The subcode bytes of the remaining 96 frames of a sector are split into eight 96-bit long subcode channels (also called subchannels or simply channels) by putting together the nth bit of each subcode byte.
Segments are organized into sectors, which contain 98 segments each. The subcode bytes of the first two segments of a sector serve as two synchronization words. The subcode bytes of the remaining 96 segments of a sector are divided into eight 96-bit long subcode channels (also referred to as subchannels or simply channels) by combining the nth bit of each subcode byte.