US 7,321,549 B2
Optical disk, optical disk recording method and optical disk apparatus
Yutaka Okamoto, Chofu (Japan); Hideo Ando, Hino (Japan); Chosaku Noda, Kawasaki (Japan); and Yutaka Kashihara, Fuchu (Japan)
Assigned to Kabushiki Kaisha Toshiba, Kawasaki-shi (Japan)
Filed on Nov. 28, 2006, as Appl. No. 11/564,081.
Application 11/328132 is a division of application No. 11/059386, filed on Feb. 17, 2005, granted, now 7,012,873.
Application 11/059386 is a division of application No. 10/748142, filed on Dec. 31, 2003, granted, now 6,870,804.
Application 10/748142 is a division of application No. 10/441119, filed on May 20, 2003, granted, now 6,711,111.
Application 10/441119 is a division of application No. 09/861715, filed on May 22, 2001, granted, now 6,587,417.
Application 11/564081 is a continuation of application No. 11/328132, filed on Jan. 10, 2006.
Claims priority of application No. 2000-151421 (JP), filed on May 23, 2000.
Prior Publication US 2007/0097848 A1, May 03, 2007
This patent is subject to a terminal disclaimer.
Int. Cl. G11B 7/24 (2006.01)
U.S. Cl. 369—275.4  [369/275.1; 369/59.22; 369/59.1] 1 Claim
OG exemplary drawing
 
1. An optical disc, comprising:
a first area including first data formed as pre-pit data; and
a second recording area being configured to store second recording data,
wherein
a minimum mark length of the second recording data is based on a 2T system, the second recording data being recorded in such a manner as to be detected in partial response and maximum likelihood (PRML) detecting system, the first data is adapted to be measured by a first circuit including a slicer, the second recording data is adapted to be detected by a second circuit which differs from the first circuit, the second circuit includes the PRML detecting system, and the first data and the second recording data are formed according to a NRZI manner.