Magnetic disk device and sector processing method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsKazumi Fujimoto, Takao Furuhashi
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Abstract
According to one embodiment, a magnetic disk device includes a disk having a first sector including first servo data, first user data, and first correction information used to correct a data error, a head that writes data to the disk and that reads data from the disk, and a controller that changes, according to a first defect length of a defect generated in the first sector in a circumferential direction of the disk, a first sector length of the first sector in the circumferential direction.
Claims14
A magnetic disk device comprising:
- a disk having a first sector including first servo data, first user data, and first correction information used to correct a data error;
- a head that writes data to the disk and that reads data from the disk;
- and
- a controller that changes, according to a first defect length of a defect generated in the first sector in a circumferential direction of the disk, a first sector length of the first sector in the circumferential direction, wherein
- the controller adds first additional information to the first correction information according to the first defect length, and
- a first information length of the first additional information in the circumferential direction is the same as the first defect length.
A magnetic disk device comprising:
- a disk having a first sector including first servo data, first user data, and first correction information used to correct a data error;
- a head that writes data to the disk and that reads data from the disk;
- and
- a controller that changes, according to a first defect length of a defect generated in the first sector in a circumferential direction of the disk, a first sector length of the first sector in the circumferential direction, wherein
- the controller extends the first sector length according to the first defect length, and
- the controller extends the first sector length according to a characteristic including an error rate of the first sector, a floating fluctuation of the head in the first sector, and a position shift in a core shift correction of the head in the first sector.
A magnetic disk device comprising:
- a disk having a first sector including first servo data, first user data, and first correction information used to correct a data error;
- a head that writes data to the disk and that reads data from the disk;
- and
- a controller that changes, according to a first defect length of a defect generated in the first sector in a circumferential direction of the disk, a first sector length of the first sector in the circumferential direction, wherein
- the controller writes a pattern different from the first sector other than the defect to the defect, and stops a read process when the pattern is detected.
A magnetic disk device comprising:
- a disk having a first sector including first servo data, first user data, and first correction information used when an error correction for data is performed;
- a head that writes data to the disk and that reads data from the disk;
- and
- a controller that changes a first sector length of the first sector in a circumferential direction of the disk according to a read/write characteristic, during a write process and a read process, including a recording layer unevenness of the disk, a floating fluctuation of the head in the first sector, and a trajectory shift of the head in the first sector.
A sector processing method applied to a magnetic disk device including a disk having a first sector including first servo data, first user data, and first correction information used to correct a data error, and a head that writes data to the disk and that reads data from the disk, the method comprising:
- changing, according to a first defect length of a defect generated in the first sector in a circumferential direction of the disk, a first sector length of the first sector in the circumferential direction;
- adding first additional information to the first correction information according to the first defect length;
- and
- a first information length of the first additional information in the circumferential direction is the same as the first defect length.
A sector processing method applied to a magnetic disk device including a disk having a first sector including first servo data, first user data, and first correction information used to correct a data error, and a head that writes data to the disk and that reads data from the disk, the method comprising:
- changing, according to a first defect length of a defect generated in the first sector in a circumferential direction of the disk, a first sector length of the first sector in the circumferential direction;
- extending the first sector length according to the first defect length;
- and
- extending the first sector length according to a characteristic including an error rate of the first sector, a floating fluctuation of the head in the first sector, and a position shift in a core shift correction of the head in the first sector.
Dependencies are inferred from the claim text.