DYNAMIC BAND BOUNDARIES
First Claim
1. An apparatus comprising:
- a data storage medium having;
a first band of multiple tracks including a first sequence of circumferentially adjacent data sectors;
a second band of multiple tracks including a second sequence of circumferentially adjacent data sectors;
a first guard area disposed between the first sequence and the second sequence such that no sector of the first sequence is directly adjacent to a sector of the second sequence, the first guard area comprising sectors not designated for storing data;
a controller configured to;
restructure the first sequence by adjusting a boundary of the first band to include a selected sector from the first guard area to produce a shifted first sequence; and
designate the selected sector for storing data.
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Accused Products
Abstract
Systems and methods are disclosed for dynamic band boundaries in data storage devices, particularly devices employing shingled magnetic recording. Band boundaries may be modified to include spare sectors from guard areas between bands to achieve field defect-slipping. Band boundaries can also be shifted to migrate spare sectors from one guard area to another in order to dynamically distribute spare sectors. In one embodiment, an apparatus may comprise a data storage medium and a controller. The data storage medium may have a first and second sequence of circumferentially adjacent data sectors, and a first guard area disposed between the first and second sequence such that no sector of the first sequence is directly adjacent to a sector of the second sequence. The controller may be configured to restructure the first sequence to include a sector from the first guard area to produce a shifted first sequence.
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Citations
20 Claims
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1. An apparatus comprising:
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a data storage medium having; a first band of multiple tracks including a first sequence of circumferentially adjacent data sectors; a second band of multiple tracks including a second sequence of circumferentially adjacent data sectors; a first guard area disposed between the first sequence and the second sequence such that no sector of the first sequence is directly adjacent to a sector of the second sequence, the first guard area comprising sectors not designated for storing data; a controller configured to; restructure the first sequence by adjusting a boundary of the first band to include a selected sector from the first guard area to produce a shifted first sequence; and designate the selected sector for storing data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
a controller configured to; restructure a first band of multiple data tracks including a first sequence of circumferentially adjacent data sectors of a data storage medium to include a selected sector from a first guard area to produce a shifted first sequence, the first guard area disposed between the first band and a second band of multiple data tracks including a second sequence of circumferentially adjacent data sectors such that no sector of the first sequence is directly adjacent to a sector of the second sequence, the first guard area comprising sectors not designated for storing data; and designate the selected sector for storing data. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A device comprising:
a data storage apparatus including; a data storage medium having; a plurality of bands of multiple tracks configured to store data in a shingled manner where one track partially overlaps an adjacent track; guard areas disposed between bands so that no sector of one band is adjacent to a sector in another band, a guard area including; a plurality of sectors designated as not for storing user data; a first spare sector; and a controller configured to; shift a boundary of a first band by converting the first spare sector to a usable data sector of the first band. - View Dependent Claims (18, 19, 20)
Specification