INFORMATION STORAGE USING SERVO PATTERNS
First Claim
1. A data storage medium comprising:
- a servo band and at least one data track adjacent to the servo band;
a first set of servo patterns within the servo band and comprised of at least two servo patterns, each servo pattern in the first set of servo patterns comprising a same number and orientation of a plurality of servo marks as the other servo patterns of the first set of servo patterns; and
a second set of servo patterns within the servo band and comprised of at least two servo patterns, each servo pattern in the second set of servo patterns comprising a same number and orientation of a plurality of servo marks as the other servo patterns of the second set of servo patterns, wherein a leading servo mark of the second set of servo patterns follows a last servo mark of the first set of servo patterns;
wherein a first distance between a servo pattern of the first set of servo patterns and a corresponding servo pattern of the second set of servo patterns represents at least a portion of supplemental information stored in the servo band separate from information relating to a position error signal (PES) that is based on the servo patterns within the servo band.
1 Assignment
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Accused Products
Abstract
Storage media, systems, and techniques for storing and accessing information in a servo band are described. For example, the distances between adjacent servo patterns written to the servo band may be varied to represent the supplemental information stored in the servo band. Each of the varied distances may be selected to represent physical parameters of the storage medium, servo recording conditions, or data unrelated to the servo patterns, for example. The supplemental information may be recovered from the servo band by demodulating a signal generated from a servo read head. The distances between each servo pattern in the track may be calculated from the time periods detected in the signal between servo marks of subsequent servo patterns. In some examples, a controller may adjust one or more parameters associated with reading or writing servo marks or data marks of the storage media.
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Citations
20 Claims
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1. A data storage medium comprising:
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a servo band and at least one data track adjacent to the servo band; a first set of servo patterns within the servo band and comprised of at least two servo patterns, each servo pattern in the first set of servo patterns comprising a same number and orientation of a plurality of servo marks as the other servo patterns of the first set of servo patterns; and a second set of servo patterns within the servo band and comprised of at least two servo patterns, each servo pattern in the second set of servo patterns comprising a same number and orientation of a plurality of servo marks as the other servo patterns of the second set of servo patterns, wherein a leading servo mark of the second set of servo patterns follows a last servo mark of the first set of servo patterns; wherein a first distance between a servo pattern of the first set of servo patterns and a corresponding servo pattern of the second set of servo patterns represents at least a portion of supplemental information stored in the servo band separate from information relating to a position error signal (PES) that is based on the servo patterns within the servo band. - View Dependent Claims (2, 3, 4, 5, 7, 8, 10, 11)
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6. (canceled)
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9. (canceled)
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12. A method comprising:
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receiving a signal from a servo read head, wherein the signal is generated by a servo band of a data storage medium passing by the servo read head; identifying, from the signal, a first set of servo patterns, within the servo band, comprised of at least two servo patterns, each servo pattern in the first set of servo patterns comprising a same number and orientation of a plurality of servo marks as the other servo patterns of the first set of servo patterns; identifying, from the signal, a second set of servo patterns, within the servo band, comprised of at least two servo patterns, each servo pattern in the second set of servo patterns comprising a same number and orientation of a plurality of servo marks as the other servo patterns of the second set of servo patterns, wherein a leading servo mark of the second set of servo patterns follows a last servo mark of the first set of servo patterns; determining, by a processor, a first time period between a selected servo pattern of the first set of servo patterns and a corresponding servo pattern of the second set of servo patterns; and calculating, by the processor and based on the determined first time period, a first distance between the selected servo pattern of the first set of servo patterns and the corresponding servo pattern of the second set of servo patterns, wherein the first distance is representative of at least a portion of supplemental information stored in the servo band separate from information relating to a position error signal (PES) that is based on the servo patterns within the servo band. - View Dependent Claims (13, 14, 15, 16)
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17. (canceled)
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18. A system comprising:
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a servo read head configured generate a signal from a servo band of a data storage medium passing by the servo read head; and a control module configured to; receive the signal from the servo read head; identify, from the signal, a first set of servo patterns, within the servo band, comprised of at least two servo patterns, each servo pattern in the first set of servo patterns comprising a same number and orientation of a plurality of servo marks as the other servo patterns of the first set of servo patterns; identify, from the signal, a second set of servo patterns, within the servo band, comprised of at least two servo patterns, each servo pattern in the second set of servo patterns comprising a same number and orientation of a plurality of servo marks as the other servo patterns of the second set of servo patterns, wherein a leading servo mark of the second set of servo patterns follows a last servo mark of the first set of servo patterns; determine a time period between a selected servo pattern of the first set of servo patterns and a corresponding servo pattern of the second set of servo patterns; and calculate, based on the determined time period, a distance between the selected servo pattern of the first set of servo patterns and the corresponding servo pattern of the second set of servo patterns, wherein the distance is representative of at least a portion of supplemental information stored in the servo band separate from information relating to a position error signal (PES) that is based on the servo patterns within the servo band. - View Dependent Claims (19)
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20. (canceled)
Specification