# US 6,163,521 A · Disk having read-only and read-write areas

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 6,163,521 A
- Document ID: US6163521A
- Status: Granted
- Kind: A
- Application number: 09/059,191
- Filed: 1998-04-13
- Granted: 2000-12-19
- Earliest claimed: 1997-04-16
- Assignees: Matsushita Electric Industrial Co., Ltd.
- Inventors: Shinichi Konishi; Fumiaki Ueno
- Web page: https://patentgrep.com/patent/US6163521A

## CPC

- G11B 7/0079: {Zoned data area, e.g. having different data structures or formats for the user data within data layer, Zone Constant Linear Velocity [ZCLV], Zone Constant Angular Velocity [ZCAV], carriers with RAM and ROM areas}
- G11B 7/00745: {Sectoring or header formats within a track (formats in general G11B20/12)}
- G11B 7/126: Circuits, methods or arrangements for laser control or stabilisation
- G11B 20/1258: {where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs}
- G11B 27/19: by using information detectable on the record carrier
- G11B 27/24: by sensing features on the record carrier other than the transducing track {; sensing signals or marks recorded by another method than the main recording}
- G11B 27/3027: {used signal is digitally coded}
- G11B 7/26: Apparatus or processes specially adapted for the manufacture of record carriers
- G11B 2020/1232: {sector, i.e. the minimal addressable physical data unit}
- G11B 2020/1238: {track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located}
- G11B 2020/1242: {the area forming one or more zones, wherein each zone is shaped like an annulus or a circular sector}
- G11B 2020/1248: {ROM zone, i.e. an unrewritable zone}
- G11B 2020/1259: {with ROM/RAM areas}
- G11B 2020/1265: {Control data, system data or management information, i.e. data used to access or process user data}
- G11B 2020/1267: {Address data}
- G11B 2020/1274: {stored in pre-pits, i.e. in embossed pits, ROM marks or prepits}
- G11B 2020/1287: {Synchronisation pattern, e.g. VCO fields}
- G11B 2020/1294: {Increase of the access speed}
- G11B 2220/211: Discs having both read-only and rewritable or recordable areas containing application data; Partial ROM media
- G11B 2220/2537: Optical discs
- G11B 2220/2562: DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A disk of the present invention includes a first storage area for reproducing data and a second storage area for recording and reproducing data, the number of sectors in each track in the first and second storage areas close to each other is larger in the first storage area than in the second storage area, and leading edges of sectors in each track in the first storage area are aligned in at least one line in a radius direction.

## Claims

### Claim 1

A disk comprising:
a read-only storage area for reproducing data; and
a read-write storage area for recording and reproducing data, the read-write storage area being close to the read-only storage area,
wherein the number of sectors in each track of the read-only storage area and the read-write storage area close to each other is larger in the read-only storage area than in the read-write storage area, and
leading edges of the sectors in each track of the read-only storage area are aligned in at least one line.

### Claim 2 (depends on 1)

A disk according to claim 1, wherein the leading edge of each sector in the read-only storage area and the leading edge of each sector in the read-write second storage area are aligned in at least one line in a radius direction.

### Claim 3 (depends on 1)

A disk according to claim 1, wherein a portion in which data is not recorded is placed between the read-only storage area and the read-write storage area.

### Claim 4 (depends on 1)

A disk according to claim 1, wherein addresses are continuously provided to the read-only and read-write storage areas.

### Claim 5 (depends on 1)

A disk according to claim 1, wherein information indicating a boundary position between the read-only storage area and the read-write storage area is recorded in a backup data portion in the read-only storage area.

### Claim 6 (depends on 1)

A disk according to claim 1, where in the read-only storage area is located radially inward of the read-write storage area.

### Claim 7

A disk comprising:
a read-only storage area for reproducing data; and
a read-write storage area for recording and reproducing data,
wherein the read-write storage area is divided into a plurality of zones, and the number of sectors in each zone on an inner side of the disk is smaller than on an outer side, and
leading edges of sectors in each track in the read-only storage area are radially arranged.

### Claim 8 (depends on 7)

A disk according to claim 7, wherein the number of tracks in each zone in the write-only storage area is equal to each other.

### Claim 9 (depends on 7)

A disk according to claim 7, wherein the leading edge of each sector in the read-only storage area and the leading edge of each sector in the read-write storage area are aligned in at least one line in a radius direction.

### Claim 10 (depends on 7)

A disk according to claim 7, wherein a portion in which data is not recorded is placed between the read-only storage area and the read-write storage area.

### Claim 11 (depends on 7)

A disk according to claim 7, where in addresses area continuously provided to the read-only and read-only storage areas.

### Claim 12 (depends on 7)

A disk according to claim 7, wherein information indicating a boundary position between the read-only storage area and the read-write storage area is recorded in a backup data portion in the read-only storage area.

### Claim 13 (depends on 7)

A disk according to claim 7, wherein the read-only storage area includes a backup data portion and a user data portion,
all leading edges of the respective sectors are radially arranged in the backup data portion,
the user data portion is divided into a plurality of zones, and the leading edges of the respective sectors are radially arranged in each zone of the user data portion,
the read-write storage area is divided into a plurality of zones, and the leading edges of the respective sectors are radially arranged in each zone of the read-write storage area, and
the number of tracks in each zone of the read-only and read-write storage areas is equal to each other.

### Claim 14 (depends on 7)

A disk according to claim 7, wherein an address of a leading sector in each zone is determined in accordance with a position in a radius direction of the leading sector.