Write and/or erase method and storage apparatus

1. A write and/or erase method for a storage apparatus which writes and/or erases information by irradiating a light beam with respect to a target track on a recording medium, comprising the steps of:

(a) setting a write and/or erase power of the light beam with respect to the target track; and

(b) setting a write and/or erase slice level that is used to detect an off-track of the light beam with respect to the target track depending on the write and/or erase power,

wherein said step (b) decreases the write and/or erase slice level depending on an increase of the write and/or erase power or, increases the write and/or erase slice level depending on a decrease of the write and/or erase power.

2. The write and/or erase method as claimed in claim 1 , wherein said step (b) also sets an off-track detection time constant depending on the write and/or erase power.

3. The write and/or erase method as claimed in claim 1 , wherein said step (b) also sets a shock detection time constant that is used to detect an external vibration or shock depending on the write and/or erase power.

4. A write and/or erase method for a storage apparatus which writes and/or erases information by irradiating a light beam with respect to a target track on a recording medium, comprising the steps of:

(a) setting a write and/or erase power of the light beam with respect to the target track is located; and

(b) setting a write and/or erase slice level that is used to detect an external vibration or shock applied on the storage apparatus with respect to the target track depending on the write and/or erase powers,

wherein said step (b) decreases the write and/or erase slice level depending on an increase of the write and/or erase power or, increases the write and/or erase slice level depending on a decrease of the write and/or erase power.

5. The write and/or erase method as claimed in claim 4 , wherein said step (b) also sets an off-track detection time constant depending on the write and/or erase power.

6. The write and/or erase method as claimed in claim 4 , wherein said step (b) also sets a shock detection time constant that is used to detect an external vibration or shock depending on the write and/or erase power.

7. A write and/or erase method for a storage apparatus which writes and/or erases information by irradiating a light beam with respect to a target track on recording medium, comprising the steps of:

(a) setting a write and/or erase power of the light beam with respect to the target track; and

(b) setting at least one parameter selected from write and/or erase parameters depending on the write and/or erase power, said write and/or erase parameters including a first write and/or erase slice level that is used to detect an off-track of the light beam with respect to the target track, an off-track detection time constant, a second write and/or erase slice level that is used to detect an external vibration or shock applied on the storage apparatus, and a shock detection time constant that is used to detect the external vibration or shock,

wherein said step (b) decreases at least the first or second write and/or erase slice level depending on an increase of the write and/or erase power or, increases at least the first or second write and/or erase slice level depending on a decrease of the write and/or erase power, as the at least one parameter.

8. The write and/or erase method as claimed in claim 7 , wherein a dependency with which the write parameters are set with respect to the write power is different from a dependency with which the erase parameters are set with respect to the erase power.

9. The write and/or erase method as claimed in claim 7 , further comprising the step of:

(c) judging a type of the recording medium,

said step (b) being carried out when said step (c) judges that the recording medium is a high-density recording medium.

10. A storage apparatus which writes and/or erases information by irradiating a light beam with respect to a target track on a recording medium, comprising:

a first setting section configured to set a write and/or erase power of the light beam with respect to the target track; and

a second setting section configured to set a write and/or erase slice level that is used to detect an off-track of the light beam with respect to the target track depending on the write and/or erase power,

wherein said second setting section decreases the write and/or erase slice level depending on an increase of the write and/or erase power or, increases the write and/or erase slice level depending on a decrease of the write and/or erase power.

11. The storage apparatus as claimed in claim 10 , wherein said second setting section also sets an off-track detection time constant depending on the write and/or erase power.

12. The storage apparatus as claimed in claim 10 , wherein said second setting section also sets a shock detection time constant that is used to detect an external vibration or shock depending on the write and/or erase power.

13. A storage apparatus which writes and/or erases information by irradiating a light beam with respect to a target track on a recording medium, comprising:

a first setting section configured to set a write and/or erase power of the light beam with respect to the target track; and

a second setting section configured to set a write and/or erase slice level that is used to detect an external vibration or shock applied on the storage apparatus with respect to the target track depending on the write and/or erase power,

wherein said second setting section decreases the write and/or erase slice level depending on an increase of the write and/or erase power or, increases the write and/or erase slice level depending on a decrease of the write and/or erase power.

14. The storage apparatus as claimed in claim 13 , wherein said second setting section also sets an off-track detection time constant depending on the write and/or erase power.

15. The storage apparatus as claimed in claim 13 , wherein said second setting section also sets a shock detection time constant that is used to detect an external vibration or shock depending on the write and/or erase power.

16. A storage apparatus which writes and/or erases information by irradiating a light beam with respect to a target track on a recording medium, comprising:

a first setting section configured to set a write and/or erase power of the light beam with respect to the target track; and

a second setting section configured to set at least one parameter selected from write and/or erase parameters depending on the write and/or erase power, said write and/or erase parameters including a first write and/or erase slice level that is used to detect an off-track of the light beam with respect to a track on the recording medium, an off-track detection time constant, a second write and/or erase slice level that is used to detect an external vibration or shock applied on the storage apparatus, and a shock detection time constant that is used to detect the external vibration or shock,

wherein said second setting section decreases at least the first or second write and/or erase slice level depending on an increase of the write and/or erase power or, increases at least the first or second write and/or erase slice level depending on a decrease of the write and/or erase power, as the at least one parameter.

17. The storage apparatus as claimed in claim 16 , wherein a dependency with which the write parameters are set with respect to the write power is different from a dependency with which the erase parameters are set with respect to the erase power.

18. The storage apparatus as claimed in claim 16 , further comprising:

a judging section configured to judge a type of the recording medium,

wherein said second setting section sets said at least one parameter when said judging section judges that the recording medium is a high-density recording medium.