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US 6,275,346 B1Granted
Technique of optimizing read/write channel parameters
AssigneeSamsung Electronics Co., Ltd.
InventorsGyu-Taek Kim, Jong-Yun Yun
Life of this patent
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Abstract
A read/write channel parameter optimization technique in a hard disk drive having a read/write channel circuit reduces an error rate during a data read/write operation through optimization of read and write channel parameters, write channel parameters are optimized by searching for the optimized level of each write channel parameter in accordance with characteristics of all head/zone combinations from data write and read operations of the same number while varying levels of the write channel parameter. In read channel parameter optimization, an optimized read channel parameter combination is searched for by suppressing noise through data write and read operations of the same number on varied read channel parameter combinations.
Claims22
A write channel parameter optimization method in a hard disk drive having a read/write channel circuit, comprising the steps of:
- designating a track as a test track in a selected one of a plurality of head/zone combinations, each head/zone combination including a zone on a disk surface and head of the hard disk drive corresponding to the zone;
- searching for an optimum level of a write channel parameter by writing a data pattern in the designated test track of a selected head/zone combination at each of a plurality of levels of the write channel parameter, and reading the data pattern written at each level of the plurality of levels of the write channel parameter to determine the optimum level of the write channel parameter;
- and
- performing write tests and read tests on the optimum level and on a default level of the write channel parameter to determine an optimized write channel parameter value, and recording one of the default level and the optimum level of the write channel parameter as the optimized write channel parameter value for the selected head/zone combination.
1 more element
A read channel parameter optimization method in a hard disk drive having a read/write channel circuit, comprising the steps of:
- designating a track as a test track in a selected one of a plurality of head/zone combinations, each head/zone combination including a zone on a disk surface and a head of the hard disk drive corresponding to the zone;
- searching for an optimum read channel parameter combination by determining an error number for each of a plurality of read channel parameter combinations from data pattern write and read operations on the designated test track of a selected head/zone combination for each of the plurality of read channel parameter combinations to determine the optimum read channel parameter combination;
- and
- performing write tests and read tests on the optimum read channel parameter combination and on a default read channel parameter combination to determine an optimized read channel parameter combination, and recording one of the default read channel parameter combination and the optimum read channel parameter combination as the optimized read channel parameter combination for the selected head/zone combination.
1 more element
A read/write channel parameter optimization method in a hard disk drive having a read/write channel circuit, comprising the steps of:
- designating a track as a test track in a selected one of a plurality of head/zone combinations, each head/zone combination including a zone on a disk surface and a head of the hard disk drive corresponding to the zone;
- searching for an optimum level of a write channel parameter by performing data write operations and read operations on the designated test track of a selected head/zone combination to determine the optimum level of the write channel parameter, and recording one of a default level and the optimum level of the write channel parameter as an optimized write channel parameter value for the selected head/zone combination;
- and
- searching for an optimum read channel parameter combination by determining an error number for each of a plurality of read channel parameter combinations from data pattern write and read operations on designated test track of the selected head/zone combination to determine the optimum read channel parameter combination, and recording one of the optimum read channel parameter combination and a default read channel parameter combination as an optimized read channel parameter combination for the selected head/zone combination.
1 more element
A write channel parameter optimization device in a hard disk drive having a read/write channel circuit, the device comprising:
- a means for designating a track as a test track in a selected one of a plurality of head/zone combinations, each head/zone combination including a zone on a disk surface and a head of the hard disk drive corresponding to the zone;
- a means for searching for an optimum level of a write channel parameter by writing a data pattern in the designated test track for a selected head/zone combination, at each of a plurality of levels of the write channel parameter, and for reading the data pattern written at each level of the plurality of levels of the write channel parameter to determine the optimum level of the write channel parameter;
- and
- a means for performing write tests and read tests on the optimum level and on a default level of the write channel parameter to determine an optimized write channel parameter value, and for recording one of the default level and the optimum level of the write channel parameter as the optimized write channel parameter value for the selected head/zone combination.
1 more element
A read channel parameter optimization device in a hard disk drive having a read/write channel circuit, the device comprising:
- a means for designating a track as a test track in a selected one of a plurality of head/zone combinations, each head/zone combination including a zone on a disk surface and a head of the hard disk drive corresponding to the zone;
- a means for searching for an optimum read channel parameter combination by determining an error number for each of a plurality of read channel parameter combinations from data pattern write and read operations on the designated test track of a selected head/zone combination for each of the plurality of read channel parameter combinations to determine the optimum read channel parameter combination;
- and
- a means for performing tests and read tests on the optimum read channel parameter combination and on a default read channel parameter combination to determine an optimized read channel parameter combination, and for recording one of the default read channel parameter combination and the optimum read channel parameter combination as the optimized read channel parameter combination for the selected head/zone combination.
1 more element
A read/write channel parameter optimization device in a hard disk drive having a read/write channel circuit, the device comprising:
- a means for designating a track as a test track in a selected one of a plurality of head/zone combinations each head/zone combination including a zone on a disk surface and a head of the hard disk drive corresponding to the zone;
- a means for searching for an optimum level of a write channel parameter by performing data pattern write and read operations on the designated test track of a selected head/zone combination to determine the optimum level of the write channel parameter, and for recording one of a default level and the optimum level of the write channel parameter as an optimized write channel parameter value for the selected head/zone combination;
- and
- a means for searching for an optimum read channel parameter combination by determining an error number for each of a plurality of read channel parameter combinations from data pattern write and read operations on the designated test track of the selected head/zone combination to determine the optimum read channel parameter combination, and for recording one of the optimum read channel parameter combination and a default read channel parameter combination as an optimized read channel parameter combination for the selected head/zone combination.
1 more element
Dependencies are inferred from the claim text.