Eccentricity correction data recording method and recording medium having eccentricity correction data
View Patent ↗An eccentricity correction data recording method, a disk-shaped recording medium, a head position control method and an information recording and reproducing apparatus are disclosed for effective eccentricity correction on cylinders of a disk-shaped recording medium. The eccentricity correction data recording method is for position control over a recording and reproducing head on a disk-shaped recording medium having at least one user data recording area to record user data, the method including the step of recording the eccentricity correction data in a user data recording area.
1. A method of recording eccentricity correction data for position control over a recording and reproducing head on a disk-shaped recording medium having at least one user data recording area to record user data, the method comprising the step of:
recording the eccentricity correction data is recorded in a user data recording area in the same way as writing of the user data but at a location away from the user data recording location corresponding to a yaw angle,
wherein the way of writing the user data is different from a way of writing servo data.
2. The method as claimed in claim 1 , wherein the eccentricity correction data are recorded for all cylinders of the disk-shaped recording medium.
3. The method as claimed in claim 1 , wherein the eccentricity correction data are recorded in only predetermined one or more cylinders of the disk-shaped recording medium.
4. The method as claimed in claim 1 , wherein the eccentricity correction data are recorded as initial eccentricity correction data, and the initial eccentricity correction data are updated as needed during an operation on the disk-shaped recording medium.
5. The method as claimed in claim 1 , wherein the eccentricity correction data are recorded for each frequency component individually.
6. The method as claimed in claim 1 , wherein the eccentricity correction data are recorded in one or more sectors for each cylinder.
7. The method as claimed in claim 1 , wherein the eccentricity correction data are recorded for each cylinder, and the eccentricity correction data comprise at least one of eccentricity correction data on the cylinder and eccentricity correction data on a next cylinder recorded next to the cylinder in accordance with a sequential recording manner.
8. The method as claimed in claim 1 , wherein the eccentricity correction data are recorded in a center area of each cylinder.
9. A method of recording eccentricity correction data for position control over a recording and reproducing head on a disk-shaped recording medium having at least one user recording area to record user data, the method comprising the step of:
controlling the position of a recording and reproducing head when writing the user data in the recording medium based on eccentricity correction data recorded in a user recording area in the same way as writing of the user data but at a location away from the user data recording location corresponding to a yaw angle,
wherein the way of writing the user data is different from a way of writing servo data.
10. The method as claimed in claim 9 , wherein the eccentricity correction data are recorded in all cylinders of the disk-shaped recording medium.
11. The method as claimed in claim 9 , wherein the eccentricity correction data are recorded in only predetermined one or more cylinders of the disk-shaped recording medium.
12. An information recording and reproducing apparatus, comprising:
a disk-shaped recording medium having at least one user data recording area to record user data, the recording medium storing eccentricity correction data in a user data recording area of the recording medium in the same way as writing of the user data but at a location away from the user data recording location corresponding to a yaw angle,
wherein the way of writing the user data is different from a way of writing servo data.