Matsushita Electric Industrial Co., Ltd.

Mitsubishi Denki Kabushiki Kaisha

Matsushita Electrical Industrial Co., Ltd.

Other

Matsushita Electric Co., Ltd.

Isao Satoh

Yoshihisa Fukushima

Yuji Takagi

Shunji Ohara

Yuzuru Kuroki

Yasushi Azumatani

Makoto Ichinose

Hiroshi Hamasaka

Takashi Ishida

Kenji Koishi

Yoshinari Takemura

Tomio Yoshida

Takahiro Nagai

Yoshikazu Goto

Yuuji Takagi

Yuji Hisakado

Tatuo Sugimura

Katsumi Murai

Kazuhiko Nakane

Masato Nagasawa

Yoshinobu Ishida

Noboru Yamada

Motoshi Ito

Sadao Mizuno

Shin-ichi Tanaka

Tamotsu Matsuo

Shunji Harigae

Akira Mutoh

Makoto Kato

Makoto Usui

Hiroyuki Ohata

Kenji Gotoh

Yasuhiro Gotoh

Yoshito Aoki

Noboru Itoh

Tatsuo Sugimura

Toyoji Gushima

Michiyoshi Nagashima

Hironori Deguchi

Fumio Yamazaki

Yukio Sakai

Kazunori Kono

Yoshihiko Imai

Yoshitaka Mitui

Jun Hiroyoshi

Takagi Yuji

Shigehiko Hiraoka

Sadao Mizumo

In a recording and reproducing apparatus for a disc-shaped recording medium, and a defect substitution method for a disc-shaped recording medium (), whether reproduction of recorded data is good is determined by sector unit and not by product code unit, defective sector discrimination is performed by sector unit, and only sectors determined defective are alternately recorded, when using a recording format in which data that is error detection and correction coded with a product code is segmented and recorded to a plurality of sectors.

Recording defect substitution method for a disc-shaped recording medium, and a recording and reproducing apparatus for a disc-shaped recording medium

A multi-layered optical disk comprising a plurality of recording layers accumulated in the thickness direction wherein a light beam is focused on one of tracks of one of the layers thereby to record and reproduce data, the optical disk being characterized in that recording layers each have an identification section storing an address of the recording layer which the identification section belongs to.

Multi-layered optical disk and method of detecting a track

A multi-layered optical disk comprising a plurality of recording layers accumulated in the thickness direction wherein a light bean is focused on one of tracks of one of the layers thereby to record and reproduce data, the optical disk being characterized in that recording layers each have an identification section storing an address of the recording layer which the identification section belongs to.

Method of retrieving information with layer identification data from a multi-layered optical disk

Recording defect substitution method of a disc-shaped recording medium, and a recording and reproducing apparatus for a disc-shaped recording medium

In a recording and reproducing apparatus for a disc-shaped recording medium, and a defect substitution method for a disc-shaped recording medium, whether reproduction of recorded data is good is determined by sector unit and not by product code unit, defective sector discrimination is performed by sector unit, and only sectors determined defective are alternatively recorded, when using a recording format in which data that is error detection and correction coded with a product code is segmented and recorded to a plurality of sectors.

Method for substituting defective recording of discoid recording medium and discoid recording medium recording and reproducing device

Multi-layered optical disk with shifted track and layer identification and method of detecting a track

Information recording method, information recording/reproducing apparatus, and information recording medium

A recording/reproducing device which is thinner when it is loaded with and without a cartridge, except while a cartridge is being inserted or taken out. A first cabinet ( ) incorporates recording/reproducing means and has an opened top. A second cabinet ( ) is so connected to the first cabinet ( ) as to close the opening of the first cabinet ( ). The second cabinet is so fitted in the first cabinet ( ) as to sink in the thickness of the first cabinet ( ) as shown in FIG. ( ) when a cartridge ( ) is loaded and not loaded therein, except while the cartridge ( ) is being inserted or taken out. While the cartridge ( ) is inserted or taken out, the second cabinet ( ) is separated by a distance d from the first cabinet ( ) as shown in FIG. ( ), thereby defining an opening through which the cartridge ( ) is inserted/taken out.

Recording/reproducing device

The optical disk of this invention includes a read-only area in which a plurality of read-only tracks are formed and a rewritable area in which a plurality of rewritable tracks are formed, wherein each of the plurality of read-only tracks is divided into a plurality of first sectors, a signal is prerecorded in at least one of the plurality of first sectors under a predetermined reproduction format, each of the plurality of rewritable tracks is divided into a plurality of second sectors, a signal is recordable in at least one of the plurality of second sectors under a predetermined recording format including the predetermined reproduction format, and the read-only area is located on an inner portion of the optical disk, while the rewritable area is located on an outer portion of the optical disk.

Optical disk having read-only and rewritable areas

In a recording and reproducing apparatus for a disc-shaped recording medium, and a defect substitution method for a disc-shaped recording medium, whether reproduction of recorded data is good is determined by sector unit and not by product code unit, defective sector discrimination is performed by sector unit, and only sectors determined defective are alternately recorded, when using a recording format in which data that is error detection and correction coded with a product code is segmented and recorded to a plurality of sectors.

An information recording method has; a history determination step for determining whether or not a medium being cased and capable of being used for information recording and reproduction has previously been taken out from the case by using an identification section having historical information as to whether the medium has previously been taken out from the case or not; and a verification step for verifying correctness of information recorded always or on condition that a predetermined condition is satisfied when a result of the determination shows that the medium has previously been taken out from the case.

Growing community of inventors

Neyagawa, Japan

Isao Satoh