Claims
- 1. An optical disk, comprising:
- a test region used to optimize a write power level used to record data and a slice level used to reproduce data;
- wherein a specific data pattern is recorded at plural write power levels in said test region and after each time said specific data pattern is recorded, said specific data pattern is reproduced plural times using different offset values and a number of errors is determined for each offset value;
- wherein an optimum combination of write power level and offset value is determined among plural combinations each of which consists of a selected one of said plural write power levels and a selected one of said offset values, said optimum combination yielding a lowest number of errors during reproduction;
- wherein said specific data pattern comprises domain portions and non-domain portions both uniformly distributed.
- 2. An optical disk, comprising:
- a test region used to optimize a write power level used to record data and a slice level used to reproduce data;
- wherein a specific data pattern is recorded at plural write power levels in said test region and after each time said specific data pattern is recorded, said specific data pattern is reproduced plural times using different slice levels and a number of errors is determined for each slice level;
- wherein an optimum combination of write power level and slice level is determined among plural combinations each of which consists of a selected one of said plural write power levels and a selected one of said slice levels, said optimum combination yielding a lowest number of errors during reproduction; and
- wherein the specific data pattern comprises domain portions and non-domain portions both uniformly distributed.
- 3. An optical disk, comprising:
- a test region used to optimize a write power level used to record data and a slice level used to reproduce data;
- wherein a specific data pattern is recorded at plural write power levels in said test region and after each time said specific data pattern is recorded, said specific data pattern is reproduced plural times using different offset values and a number of errors is determined for each offset value;
- wherein an optimum combination of write power level and offset value is determined among plural combinations each of which consists of a selected one of said plural write power levels and a selected one of said offset values, said optimum combination yielding a lowest number of errors during reproduction;
- wherein the specific data pattern comprises a domain portion whose forming density changes rapidly from a high degree to a low degree or vice versa.
- 4. An optical disk, comprising:
- a test region used to optimize a write power level used to record data and a slice level used to reproduce data;
- wherein a specific data pattern is recorded at plural write power levels in said test region and after each time said specific data pattern is recorded, said specific data pattern is reproduced plural times using different slice levels and a number of errors is determined for each slice level;
- wherein an optimum combination of write power level and slice level is determined among plural combinations each of which consists of a selected one of said plural write power levels and a selected one of said slice levels, said optimum combination yielding a lowest number of errors during reproduction; and
- wherein the specific data pattern comprises a domain portion whose forming density changes rapidly from a high degree to a low degree or vice versa.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7-331509 |
Dec 1995 |
JPX |
|
Parent Case Info
This is a divisional of application Ser. No. 09/044,608, filed Mar. 19, 1998 now U.S. Pat. No. 5,920,534, which in turn is a divisional application of Ser. No. 08/745,425 filed Nov. 12, 1996 now U.S. Pat. No. 5,777,964.
US Referenced Citations (24)
Foreign Referenced Citations (7)
Number |
Date |
Country |
61-296529 |
Dec 1986 |
JPX |
62-159347 |
Jul 1987 |
JPX |
391135 |
Apr 1991 |
JPX |
4134737 |
May 1992 |
JPX |
4315876 |
Nov 1992 |
JPX |
5101315 |
Apr 1993 |
JPX |
7129961 |
May 1995 |
JPX |
Divisions (2)
|
Number |
Date |
Country |
Parent |
044608 |
Mar 1998 |
|
Parent |
745425 |
Nov 1996 |
|