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DVD Demystified

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Quick Reference<br />

TABLE A.9<br />

Data Storage<br />

Characteristics of<br />

<strong>DVD</strong><br />

TABLE A.10<br />

<strong>DVD</strong>-Video Physical<br />

Units<br />

Modulation 8/16 (EFMPlus)<br />

Sector size (user data) 2048 bytes<br />

Logical sector size (data unit 1) 2064 bytes (2048 � 12 header � 4 EDC)<br />

Recording sector size (data unit 2) 2366 bytes (2064 � 302 ECC)<br />

Unmodulated physical sector 2418 bytes (2366 � 52 sync)<br />

(data unit 3)<br />

Physical sector size 4836 (2418 � 2 modulation)<br />

581<br />

Error correction Reed-Solomon product code (208,192,17) �<br />

(182,172,11)<br />

Error correction overhead 15% (13% of recording sector: 308/2366)<br />

ECC block size 16 sectors (32,678 bytes user data, 37,856 bytes<br />

total)<br />

Format overhead 16% (37,856/32,678)<br />

Maximum random error 280 in eight ECC blocks<br />

Channel data rate a 26.16 Mbps<br />

User data rate a 11.08 Mbps<br />

Capacity (per side, 12 cm) 4.37 to 7.95 GB (4.70 to 8.54 billion bytes)<br />

Capacity (per side, eight cm) 1.36 to 2.48 GB (1.46 to 2.66 billion bytes)<br />

a Reference value for a single-speed drive.<br />

Unit Maximum<br />

Video title set (VTS) 99 per disc<br />

Video object set (VOBS) 99 per VTS<br />

Video object (VOB) 32767 per VOBS<br />

Cell<br />

Video object unit (VOBU)<br />

255 per VOB<br />

Pack (PCK)<br />

Packet (PKT)<br />

2048 bytes

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