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US 11,386,927 B1Granted
Data storage device synchronizing first channel based on sync mark detected in second channel
AssigneeWestern Digital Technologies, Inc.
InventorsDerrick E. Burton, Weldon M. Hanson, Richard L. Galbraith, Iouri Oboukhov
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Abstract
A data storage device configured to access a magnetic tape is disclosed comprising a plurality of data tracks. A first head is configured to access a first data track comprising a first sync mark, and a second head is configured to access a second data track comprising a second sync mark. The first head is used to read first data from the first data track, wherein the first data comprises a plurality of symbols, and the second head is used to read the second sync mark from the second data track. The first data is symbol synchronized based on the second head reading the second sync mark from the second data track.
Claims20
A data storage device configured to access a magnetic tape comprising a plurality of data tracks, the data storage device comprising:
- a first head configured to access a first data track comprising a first sync mark;
- a second head configured to access a second data track comprising a second sync mark;
- and
- control circuitry configured to:
- use the first head to read first data from the first data track, wherein the first data comprises a plurality of symbols;
- use the second head to read the second sync mark from the second data track;
- and
- when the first sync mark is corrupted, symbol synchronize the first data based on the second head reading the second sync mark from the second data track.
5 more elements
A data storage device configured to access a magnetic tape comprising a plurality of data tracks, the data storage device comprising:
- a first head configured to access a first data track comprising a first sync mark;
- a second head configured to access a second data track comprising a second sync mark;
- and
- control circuitry configured to:
- use the first head to read first data from the first data track, wherein the first data comprises a plurality of symbols;
- detect the first sync mark when reading the first data track;
- use the second head to read the second sync mark from the second data track;
- symbol synchronize the first data based on the second head reading the second sync mark from the second data track;
- symbol synchronize the first data when the first sync mark is detected;
- and
- when the first sync mark is not detected, symbol synchronize the first data based on the second head reading the second sync mark from the second data track.
8 more elements
A data storage device configured to access a magnetic tape comprising a plurality of data tracks, the data storage device comprising:
- a first head configured to access a first data track comprising a first sync mark;
- a second head configured to access a second data track comprising a second sync mark;
- and
- control circuitry configured to:
- use the first head to read first data from the first data track, wherein the first data comprises a plurality of symbols;
- use the second head to read the second sync mark from the second data track;
- symbol synchronize the first data based on the second head reading the second sync mark from the second data track;
- measure a phase offset between the first head and the second head;
- and
- symbol synchronize the first data based on the second head reading the second sync mark from the second data track and based on the measured phase offset between the first head and the second head.
7 more elements
A data storage device configured to access a magnetic tape comprising a plurality of data tracks, the data storage device comprising:
- a first head configured to access a first data track comprising a first sync mark;
- a second head configured to access a second data track comprising a second sync mark;
- and
- control circuitry configured to:
- use the first head to read first data from the first data track, wherein the first data comprises a plurality of symbols;
- use the second head to read the second sync mark from the second data track;
- symbol synchronize the first data based on the second head reading the second sync mark from the second data track;
- use the first head to first write the first data to the first data track;
- use the second head to second write the second data to the second data track, wherein the second write is delayed relative to the first write by a predetermined path delay;
- and
- symbol synchronize the first data based on the second head reading the second sync mark from the second data track and based on the predetermined path delay.
8 more elements
A data storage device configured to access a magnetic tape comprising a plurality of data tracks, the data storage device comprising:
- a first head configured to access a first data track comprising a first sync mark;
- a second head configured to access a second data track comprising a second sync mark;
- a third head configured to access a third data track comprising a third sync mark;
- and
- control circuitry configured to:
- use the first head to read first data from the first data track, wherein the first data comprises a plurality of symbols;
- use the second head to read second data from the second data track, wherein the second data comprises a plurality of symbols;
- use the third head to read third data from the third data track, wherein the third data comprises a plurality of symbols;
- and
- when the first sync mark is corrupted, symbol synchronize the first data, the second data, and the third data when at least one of the first sync mark, the second sync mark, or the third sync mark is detected.
7 more elements
A data storage device configured to access a magnetic tape comprising a plurality of data tracks, the data storage device comprising:
- a first head configured to access a first data track comprising a first sync mark;
- a second head configured to access a second data track comprising a second sync mark;
- a third head configured to access a third data track comprising a third sync mark;
- and
- control circuitry configured to:
- use the first head to read first data from the first data track, wherein the first data comprises a plurality of symbols;
- use the second head to read second data from the second data track, wherein the second data comprises a plurality of symbols;
- use the third head to read third data from the third data track, wherein the third data comprises a plurality of symbols;
- symbol synchronize the first data, the second data, and the third data when at least one of the first sync mark, the second sync mark, or the third sync mark is detected;
- and
- symbol synchronize the first data, the second data, and the third data when at least two of the first sync mark, the second sync mark, or the third sync mark is detected.
8 more elements
A data storage device configured to access a magnetic tape comprising a plurality of data tracks, the data storage device comprising:
- a first head configured to access a first data track comprising a first sync mark;
- a second head configured to access a second data track comprising a second sync mark;
- a third head configured to access a third data track comprising a third sync mark;
- and
- control circuitry configured to:
- use the first head to read first data from the first data track, wherein the first data comprises a plurality of symbols;
- use the second head to read second data from the second data track, wherein the second data comprises a plurality of symbols;
- use the third head to read third data from the third data track, wherein the third data comprises a plurality of symbols;
- symbol synchronize the first data, the second data, and the third data when at least one of the first sync mark, the second sync mark, or the third sync mark is detected;
- measure a phase offset between the heads;
- and
- symbol synchronize the first data, the second data, and the third data based on measured phase offset between the heads.
9 more elements
A data storage device configured to access a magnetic tape comprising a plurality of data tracks, the data storage device comprising:
- a first head configured to access a first data track comprising a first sync mark;
- a second head configured to access a second data track comprising a second sync mark;
- a third head configured to access a third data track comprising a third sync mark;
- and
- control circuitry configured to:
- use the first head to read first data from the first data track, wherein the first data comprises a plurality of symbols;
- use the second head to read second data from the second data track, wherein the second data comprises a plurality of symbols;
- use the third head to read third data from the third data track, wherein the third data comprises a plurality of symbols;
- symbol synchronize the first data, the second data, and the third data when at least one of the first sync mark, the second sync mark, or the third sync mark is detected;
- use the first head to first write the first data to the first data track;
- use the second head to second write the second data to the second data track, wherein the second write is delayed relative to the first write by a first predetermined path delay;
- use the third head to third write the third data to the third data track, wherein the third write is delayed relative to the first write by a second predetermined path delay;
- and
- symbol synchronize the first data, the second data, and the third data based on the first and second path delays.
11 more elements
A data storage device configured to access a magnetic tape comprising a plurality of data tracks, the data storage device comprising:
- a first head configured to access a first data track comprising a first sync mark;
- a second head configured to access a second data track comprising a second sync mark;
- a means for using the first head to read first data from the first data track, wherein the first data comprises a plurality of symbols;
- a means for using the second head to read the second sync mark from the second data track;
- and
- a means for symbol synchronizing the first data based on the second head reading the second sync mark from the second data track when the first sync mark is corrupted.
3 more elements
A data storage device configured to access a magnetic tape comprising a plurality of data tracks, the data storage device comprising:
- a first head configured to access a first data track comprising a first sync mark;
- a second head configured to access a second data track comprising a second sync mark;
- a means for using the first head to read first data from the first data track, wherein the first data comprises a plurality of symbols;
- a means for detecting the first sync mark when reading the first data track;
- a means for using the second head to read the second sync mark from the second data track;
- a means for symbol synchronizing the first data based on the second head reading the second sync mark from the second data track;
- a means for symbol synchronizing the first data when the first sync mark is detected;
- and
- when the first sync mark is not detected, a means for symbol synchronize the first data based on the second head reading the second sync mark from the second data track.
6 more elements
A data storage device configured to access a magnetic tape comprising a plurality of data tracks, the data storage device comprising:
- a first head configured to access a first data track comprising a first sync mark;
- a second head configured to access a second data track comprising a second sync mark;
- a means for using the first head to read first data from the first data track, wherein the first data comprises a plurality of symbols;
- a means for using the second head to read the second sync mark from the second data track;
- a means for symbol synchronizing the first data based on the second head reading the second sync mark from the second data track;
- a means for measuring a phase offset between the first head and the second head;
- and
- a means for symbol synchronizing the first data based on the second head reading the second sync mark from the second data track and based on the measured phase offset between the first head and the second head.
5 more elements
Dependencies are inferred from the claim text.