Method and apparatus for recording data on a magnetic recording medium
OwnerMotohisa Uedainventor
Life of this patent
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Abstract
A method for recording data on a magnetic recording medium is disclosed. When data are written to a target track Tn, the numbers of effects on tracks Tn−1 and Tn+1 adjacent to a target track are counted as Adjacent Track Interference (ATI) effect counts Cn−1 and Cn+1, respectively, to determine whether or not the ATI effect counts Cn−1 and Cn+1 are greater than a permissible ATI count Np. If the ATI effect counts Cn−1 and Cn+1 are greater than the permissible ATI count Np, ATI error preventive processing is performed on the tracks Tn−1 and Tn+1. All sectors on the Tn−1 and Tn+1 are determined as to whether or not they are affected by ATI, and ATI error counter-measure processing is performed on all affected sectors to recover data.
Claims12
A method for recording data on a magnetic recording medium, said method comprising:
- providing an adjacent track interference (ATI) compensation table for storing an ATI effect count Cn along with an associated track Tn;
- counting a number of ATI effects for said track Tn;
- recording said ATI effects count in said ATI compensation table;
- determining whether or not there is any ATI affected sector appeared in said ATI compensation table;
- and
- in a determination that there is an ATI affected sector appeared in said ATI compensation table, preforming ATI error countermeasure processing to recover data and resetting said ATI effect count Cn for said track Tn.
The method of claim 3, wherein said method further includes
- reading data from a second non-write area sector immediately adjacent to said write area sector within said track Tn;
- determining whether or not ATI effect appears on said read data from said second non-write area sector;
- and
- in a determination that ATI effect appears on said read data from said second non-write area sector, storing said read data and a sector number of said second non-write area sector as an ATI-affected sector.
A computer storage medium having a computer program product for recording data on a magnetic recording medium, said computer storage medium comprising:
- computer program code for providing an adjacent track interference (ATI) compensation table for storing an ATI effect count Cn along with an associated track Tn;
- computer program code for counting a number of ATI effects for said track Tn;
- computer program code for recording said ATI effects count in said ATI compensation table;
- computer program code for determining whether or not there is any ATI affected sector appeared in said ATI compensation table;
- and
- computer program code for, in a determination that there is an ATI affected sector appeared in said ATI compensation table, preforming ATI error countermeasure processing to recover data and resetting said ATI effect count Cn for said track Tn.
An apparatus for recording data on a magnetic recording medium, said apparatus comprising:
- a detector for detecting an ATI effects count Cn for a track Tn;
- an adjacent track interference (ATI) compensation table for storing said ATI effect count Cn along with said track Tn;
- and
- a processor for determining whether or not there is any ATI affected sector appeared in said ATI compensation table, and for preforming ATI error countermeasure processing to recover data and resetting said ATI effect count Cn for said track Tn in a determination that there is an ATI affected sector appeared in said ATI compensation table.
Dependencies are inferred from the claim text.