EP0420439A1
Expired / Lapsed
EP
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Method of and apparatus for determining the position of a transducer
Assignee: Seagate Technology International
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Filing: 1990-09-11
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Granted: —
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Expires: 2010-09-11
Abstract
Abstract A method of determining the position of a transducer (14) relative to a disk in a data storage system (10), comprises the steps of: reading track identification information from a disk in the data storage system (10) to provide a coarse position signal identifying a track that the transducer is positioned over; reading position error samples from a disk in the data storage system (10) to provide a fine position signal representing transducer position error within a track that the transducer is positioned over; and correlating the coarse position signal and the fine position signal so the coarse position signal and the fine position signal correspond to the same track on the disk.
Inventors
- 👤 Gerald Lee Weispfenning
- 👤 Lloyd Chambers Goss
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 00:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5552; G11B5/5556
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
A method of determining the position of a transducer (14) relative to a disk in a data storage system (10), characterised by comprising the steps of: reading track identification information from a disk in the data storage system (10) to provide a coarse position signal identifying a track that the transducer is positioned over; reading position error samples from a disk in the data storage system (10) to provide a fine position signal representing transducer position error within a track that the transducer is positioned over; and correlating the coarse position signal and the fine position signal so the coarse position signal and the fine position signal correspond to the same track on the disk.
Claim 2
Independent Claim
115 words
A method of determining the position of a transducer (14) relative to a disk in a data storage system (10), characterised by comprising the steps of: reading track identification information from a disk in the data storage system (10) to provide a coarse position signal identifying a track that the transducer is positioned over; reading position error samples from a disk in the data storage system (10) to provide a fine position signal representing transducer position error within a track that the transducer is positioned over; and correlating the coarse position signal and the fine position signal so the coarse position signal and the fine position signal correspond to the same track on the disk.
Claim 3
Dependent Claim
54 words
A method as claimed in claim 1 characterised in that the correlating step comprises determining whether the transducer (14) has moved between tracks after reading the track identification information and before reading the position error samples and adjusting the coarse position signal to reflect the proper track identification information when the transducer has moved.
Claim 4
Dependent Claim
79 words
A method as claimed in claim 2 characterised in that the method determining step comprises determining a first sign bit corresponding to a first position error sample, determining a second sign bit corresponding to a second position error sample, determining a least significant bit of the track identification information and determining whether the transducer has moved between tracks based on the first sign bit; the second sign bit and the least significant bit of the track identi fication information.
Claim 5
Dependent Claim
72 words
A method as claimed in claim 3 characterised in that the adjusting step comprises determining a correction number to be added to the coarse position signal, the correction number having a value based on the value of the first sign bit, the second sign bit and the least significant bit of the track identification information, and combining the coarse position signal with the correction number to reflect the proper track identification information.
Claim 6
Dependent Claim
125 words
Apparatus for determining transducer position relative to a disk in a data storage system (10), characterised by comprising track reading means for reading track identification information from a disk (16) in the data storage system (10) to provide a coarse position signal (ID) identifying a track that the transducer (4) is positioned over; position error reading means for reading position error samples from a disk (16) in the data storage system to provide a fine position signal representing transducer position error within a track that the transducer (14) is positioned over; and correlating means for correlating the coarse position signal (ID) and the fine position signal so the coarse position signal (10) and the fine position signal correspond to the same track on the disk.
Claim 7
Dependent Claim
125 words
Apparatus for determining transducer position relative to a disk in a data storage system (10), characterised by comprising track reading means for reading track identification information from a disk (16) in the data storage system (10) to provide a coarse position signal (ID) identifying a track that the transducer (4) is positioned over; position error reading means for reading position error samples from a disk (16) in the data storage system to provide a fine position signal representing transducer position error within a track that the transducer (14) is positioned over; and correlating means for correlating the coarse position signal (ID) and the fine position signal so the coarse position signal (10) and the fine position signal correspond to the same track on the disk.
Claim 8
Dependent Claim
61 words
Apparatus as claimed in claim 5 characterised in that the correlating means comprises boundary crossing means for determining whether the transducer has moved between tracks after reading the track identification information and before reading the position error samples (PES1, PES2) and correction means for correcting the coarse position signal to reflect the proper track identification information when the transducer has moved.
Claim 9
Dependent Claim
108 words
Apparatus as claimed in claim 6 characterised in that the boundary crossing means comprises first sign bit detection means for detecting a first sign bit (PES1 Sign Bit) corresponding to a first position error sample (PES1), second sign bit detection means for detecting a second sign bit corresponding to a second position error sample (PES2), least significant bit detection means for detecting a least significant bit of the track identification information (TRK, ID, LSB), and first combination means (146) for combining the first sign bit, the second sign bit and the least significant bit of the track identification information to determine whether the transducer has moved between tracks.
Claim 10
Dependent Claim
72 words
Apparatus as claimed in claim 7 characterised in that the correction means comprises correction number determining means (140) for determining a correction number having a value determined by the combination of the first sign bit, the second sign bit and the least significant bit of the track identification information, and second combination means (142) for combining the correction number with the coarse position signal (ID) to reflect the proper track identification information.
References Cited (Backward Citations)
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