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708 Chapter <strong>13</strong> Optical Storage<br />
Sector Modes and Forms<br />
Mode 1 is the standard Yellow Book CD sector format with ECC and EDC to enable error-free operation.<br />
Each Mode 1 sector is broken down as shown in Tables <strong>13</strong>.9 and <strong>13</strong>.10.<br />
Table <strong>13</strong>.9 Yellow Book Mode 1 Sector Format Breakdown<br />
Yellow Book (CD-ROM) Sectors (Mode 1):<br />
--------------------------------------------------------------------<br />
Q+P parity bytes 784<br />
Subcode bytes 98<br />
--------------------------------------------------------------------<br />
Sync bytes 12<br />
Header bytes 4<br />
Data bytes 2,048<br />
EDC bytes 4<br />
Blank (0) bytes 8<br />
ECC bytes 276<br />
--------------------------------------------------------------------<br />
Bytes/sector RAW (unencoded) 3,234<br />
Table <strong>13</strong>.10 Yellow Book (CD-ROM) Mode 1 Sector Format<br />
Sync Header User Data EDC Blank ECC<br />
12 4 2,048 4 8 276<br />
Mode 2 was defined as a sector without any ECC or EDC in the original Yellow Book. Unfortunately,<br />
Mode 1 (which had ECC and EDC) couldn’t be mixed with Mode 2 sectors on the same track (program<br />
or song). To enable data with and without error detection and correction in a single track, new<br />
sector format subsets for Mode 2 sectors were added in the Green Book (CD-i) and subsequently<br />
adopted in the CD-ROM XA extensions. This enabled information that would not tolerate errors (such<br />
as programs or computer data) to be interleaved or mixed within the same track with information<br />
that would tolerate errors (such as audio or video data). These variations on Mode 2 include Form 1<br />
and Form 2 sectors. Each Mode 2, Form 1 sector is broken down as shown in Tables <strong>13</strong>.11, <strong>13</strong>.12,<br />
<strong>13</strong>.<strong>13</strong>, and <strong>13</strong>.14.<br />
Table <strong>13</strong>.11 Green Book Mode 1 Sector Format Breakdown<br />
Green Book/CD-ROM XA Sectors (Mode 2, Form 1):<br />
--------------------------------------------------------------------<br />
Q+P parity bytes 784<br />
Subcode bytes 98<br />
--------------------------------------------------------------------<br />
Sync bytes 12<br />
Header bytes 4<br />
Subheader bytes 8<br />
Data bytes 2,048<br />
EDC bytes 4<br />
ECC bytes 276<br />
--------------------------------------------------------------------<br />
Bytes/sector RAW (unencoded) 3,234
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