# US 2008/0186813 A1 · Method of adjusting write strategy of recordable disc

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- Number: US 2008/0186813 A1
- Document ID: US20080186813A1
- Status: Published application
- Kind: A1
- Application number: 12/019,581
- Filed: 2008-01-24
- Published: 2008-08-07
- Earliest claimed: 2007-02-06
- Assignees: Lite-On It Corporation
- Inventors: Chao-Wen Hu; Ling-Feng Chen; Shih-Kai Weng; Yi-Hsueh Lee
- Web page: https://patentgrep.com/patent/US20080186813A1

## CPC

- G11B 7/1267: Power calibration
- 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 method of adjusting a write strategy of a recordable disc comprises steps of: generating a test pattern on a power calibrating area of the recordable disc according to a first write strategy and a first write power; establishing a Pit-to-Land Inter-Symbol Interference table and a Land-to-Pit Inter-Symbol Interference table by measuring a plurality of Pits and Lands with different time lengths in the test pattern; and generating a second timing parameter set by adjusting a first timing parameter set of the first write strategy according to the Pit-to-Land Inter-Symbol Interference table and the Land-to-Pit Inter-Symbol Interference table.

## Claims

### Claim 1

A method of adjusting a write strategy of a recordable disc, comprising steps of:
generating a test pattern on a power calibrating area of the recordable disc according to a first write strategy and a first write power;
establishing a Pit-to-Land Inter-Symbol Interference table and a Land-to-Pit Inter-Symbol Interference table by measuring a plurality of Pits and Lands with different time lengths in the test pattern; and
generating a second timing parameter set by adjusting a first timing parameter set of the first write strategy according to the Pit-to-Land Inter-Symbol Interference table and the Land-to-Pit Inter-Symbol Interference table.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the first timing parameter set at least includes a kT first front-end overdrive time and a kT first rear-end overdrive time, the second timing parameter set at least includes a kT second front-end overdrive time and a kT second rear-end overdrive time, wherein k is any of a value of 3˜11.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the Land-to-Pit Inter-Symbol Interference table at least includes m front-edge errors from m Lands with different time lengths to a kT Pit.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the kT second front-end overdrive time is the kT first front-end overdrive time added to an average of the m front-edge errors.

### Claim 5 (depends on 2)

The method according to claim 2, wherein the Pit-to-Land Inter-Symbol Interference table at least includes n rear-edge errors from a kT Pit to n Lands with different time lengths.

### Claim 6 (depends on 5)

The method according to claim 5, wherein the kT second rear-end overdrive time is the kT first rear-end overdrive time added to an average of the n rear-edge errors.

### Claim 7

A method of adjusting a write strategy of a recordable disc, comprising steps of:
generating a plurality of Pits and Lands with different time lengths on the recordable disc according to a first write strategy and a first write power;
establishing a Pit-to-Land Inter-Symbol Interference table and a Land-to-Pit Inter-Symbol Interference table by measuring the plurality of Pits and Lands; and
generating a second timing parameter set by adjusting a first timing parameter set of the first write strategy according to the Pit-to-Land Inter-Symbol Interference table and the Land-to-Pit Inter-Symbol Interference table.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the first timing parameter set at least includes a kT first front-end overdrive time and a kT first rear-end overdrive time, the second timing parameter set at least includes a kT second front-end overdrive time and a kT second rear-end overdrive time, wherein k is any of a value of 3˜11.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the Land-to-Pit Inter-Symbol Interference table at least includes m front-edge errors from m Lands with different time lengths to a kT Pit.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the kT second front-end overdrive time is the kT first front-end overdrive time added to an average of the m front-edge errors.

### Claim 11 (depends on 8)

The method according to claim 8, wherein the Pit-to-Land Inter-Symbol Interference table at least includes n rear-edge errors from a kT Pit to n Lands with different time lengths.

### Claim 12 (depends on 11)

The method according to claim 11, wherein the kT second rear-end overdrive time is the kT first rear-end overdrive time added to an average of the n rear-edge errors.