# US 9,001,442 B2 · Detection of adjacent track interference using size-adjustable sliding window > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,001,442 B2 - Document ID: US9001442B2 - Status: Granted - Kind: B2 - Application number: 13/840,650 - Filed: 2013-03-15 - Published: 2014-09-18 - Granted: 2015-04-07 - Earliest claimed: 2013-03-15 - Assignees: Seagate Technology LLC - Applicants: Seagate Technology LLC - Inventors: Donghyuk Park; Seungyoul Jeong; Joowon Cho - Web page: https://patentgrep.com/patent/US9001442B2 ## CPC - G11B 27/36: Monitoring, i.e. supervising the progress of recording or reproducing {(for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06)} - G11B 20/10305: {signal quality assessment} - G11B 5/012: Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract Technologies are described herein for detecting adjacent track interference in a storage device using a size-adjustable sliding window. A value for an inter-track interference factor associated with at least one adjacent track is determined for a first area of a data track of the storage device. The first area may encompass a plurality of sectors of the data track. Next, it is determined whether the value of the calculated inter-track interference factor is greater than a threshold value, and if so, an indication of inter-track interference corresponding to the first area is stored in the storage device. ## Claims ### Claim 1 A method comprising steps of: determining a value for an inter-track interference factor associated with at least one adjacent track in a first area of a data track, the first area comprising a plurality of sectors of the data track; determining whether the value of the inter-track interference factor is greater than a threshold; and upon determining the value of the inter-track interference factor is greater than the threshold, storing an inter-track interference indicator corresponding to the first area, the inter-track interference indicator comprising an indication of inter-track interference from the at least one adjacent track in the first area of the data track, wherein the inter-track interference indicator corresponding to the first area is utilized to compensate for inter-track interference from the at least one adjacent track during a read of a sector of the data track associated with the first area. ### Claim 2 (depends on 1) The method of claim 1, further comprising repeating the steps for a second area of the data track, the second area encompassing different sectors of the data track than the first area. ### Claim 3 (depends on 1) The method of claim 1, wherein the inter-track interference indicator corresponding to the first area comprises the value of the inter-track interference factor. ### Claim 4 (depends on 1) The method of claim 1, wherein the inter-track interference indicator corresponding to the first area is utilized to recover from a read error of the sector of the data track associated with the first area. ### Claim 5 (depends on 1) The method of claim 1, wherein determining the inter-track interference factor comprises retrieving the inter-track interference factor from an inter-track interference compensation mechanism of a read/write channel. ### Claim 6 (depends on 1) The method of claim 1, wherein the inter-track interference factor comprises an alpha factor. ### Claim 7 (depends on 1) The method of claim 1, wherein the inter-track interference indicator corresponding to the first area is stored in a non-volatile memory. ### Claim 8 (depends on 1) The method of claim 1, wherein the storing step uses an adjacent track interference table, the adjacent track interference table storing an indication of an amount of inter-track interference from the at least one adjacent track in the first area of the data track. ### Claim 9 A non-transitory computer-readable storage medium having processor-executable instructions stored thereon that, when executed by a processor, cause the processor to: determine a value for an inter-track interference factor associated with at least one adjacent track in a first area of a data track of a storage device, wherein the first area encompasses a plurality of sectors of the data track; determine whether the value of the inter-track interference factor is greater than a threshold value; and upon determining the value of the inter-track interference factor is greater than the threshold value, store an indication of inter-track interference corresponding to the first area, the indication of inter-track interference comprising an indication of inter-track interference from the at least one adjacent track in the first area of the data track, wherein the indication of inter-track interference corresponding to the first area is utilized to compensate for inter-track interference from the at least one adjacent track during a read of a sector within the first area of the data track. ### Claim 10 (depends on 9) The computer-readable storage medium of claim 9, having further processor-executable instructions stored thereon that cause the processor to compare the value of the inter-track interference factor to a plurality of threshold values to determine a degree of inter-track interference corresponding to the first area, where the degree of inter-track interference is stored with the indication of inter-track interference corresponding to the first area. ### Claim 11 (depends on 9) The computer-readable storage medium of claim 9, having further processor-executable instructions stored thereon that cause the processor to determine the value of the inter-track interference factor for a plurality of adjacent tracks and to store an indication of inter-track interference corresponding to the first area for each of the plurality of adjacent tracks. ### Claim 12 (depends on 9) The computer-readable storage medium of claim 9, having further processor-executable instructions stored thereon that cause the processor to repeat the steps for a second area of the data track, the second area encompassing different sectors of the data track than the first area. ### Claim 13 (depends on 9) The computer-readable storage medium of claim 9, wherein the stored indication of inter-track interference corresponding to the first area comprises the value of the inter-track interference factor. ### Claim 14 (depends on 9) The computer-readable storage medium of claim 9, wherein determining the inter-track interference factor comprises retrieving the inter-track interference factor from an inter-track interference compensation mechanism of a read/write channel of the storage device. ### Claim 15 A system comprising: a hard disk drive comprising a storage medium; a processor operably connected to the hard disk drive; and an ITI detection module operably connected to the processor and configured to cause the processor to determine a value for an inter-track interference factor associated with at least one adjacent track in a first area of a data track of the storage medium, determine whether the value of the inter-track interference factor is greater than a threshold value, and upon determining the value of the inter-track interference factor is greater than the threshold value, store an indication of inter-track interference corresponding to the first area in a memory of the hard disk drive, the indication of inter-track interference comprising an indication of inter-track interference from the at least one adjacent track in the first area of the data track, wherein the stored indication of inter-track interference corresponding to the first area is utilized by a controller of the hard disk drive to compensate for inter-track interference from the at least one adjacent track during a read of data from the first area of the data track. ### Claim 16 (depends on 15) The system of claim 15, wherein determining the inter-track interference factor comprises retrieving the inter-track interference factor from an inter-track interference compensation mechanism of a read/write channel of the hard disk drive. ### Claim 17 (depends on 15) The system of claim 15, wherein the inter-track interference factor comprises an alpha factor. ### Claim 18 (depends on 15) The system of claim 15, wherein the inter-track interference factor comprises a cross-correlation factor.