# US 9,747,942 B2 · Variable written track widths for attribute-based storage > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,747,942 B2 - Document ID: US9747942B2 - Status: Granted - Kind: B2 - Application number: 14/688,598 - Filed: 2015-04-16 - Published: 2016-05-26 - Granted: 2017-08-29 - Earliest claimed: 2014-11-24 - Assignees: Seagate Technology LLC - Applicants: Seagate Technology LLC - Inventors: Kaizhong Gao; Wenzhong Zhu; Tim Rausch; Edward Gage - Web page: https://patentgrep.com/patent/US9747942B2 ## CPC - G11B 20/1217: {on discs} - G11B 5/012: Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) - G11B 5/02: Recording, reproducing, or erasing methods; Read, write or erase circuits therefor - G11B 20/1258: {where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs} - G11B 5/4866: {the arm comprising an optical waveguide, e.g. for thermally-assisted recording} - G11B 5/6088: {Optical waveguide in or on flying head} - G11B 7/0037: with discs - G11B 2005/0021: {Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal} - G11B 2020/1087: {wherein a selection is made among at least two alternative ways of processing} - G11B 2020/10888: {the kind of data being the selection criterion} - G11B 2020/1238: {track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located} - G11B 2020/1264: {wherein the formatting concerns a specific kind of data} - G11B 2020/1292: {Enhancement of the total storage capacity} - 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 A storage device controller is configured to select one of multiple written track widths for a storage location based on a write attribute of data to be recorded at the storage location. According to one implementation, the storage device controller is further configured to select a power level for a heat-assisted magnetic recording (HAMR) device based on the write attribute. ## Claims ### Claim 1 One or more computer-readable storage media of a tangible article of manufacture encoding computer-executable instructions for executing on a computer system a computer process, the computer process comprising: selecting one of multiple written track widths within a data band for a storage location based on a data type of data to be recorded at the storage location; selecting a wider written track width for the storage location responsive to a determination that the data type is cache data than a written track width selected responsive to a determination that the data type is non-cache data; and selecting a power level for operating a heat-assisted magnetic recording (HAMR) head to write the data based on the data type. ### Claim 2 (depends on 1) The one or more computer-readable storage media of claim 1, wherein selecting the power level for operating the HAMR head further comprises: selecting between at least two power levels associated with separate regions of a magnetic medium. ### Claim 3 (depends on 1) The one or more computer-readable storage media of claim 1, wherein the selected data track is within a cache region on a storage medium, the cache region including data tracks storing data at a written track width that is greater than a written track width of other data tracks on the storage medium that are not included in the cache region. ### Claim 4 (depends on 1) The one or more computer-readable storage media of claim 1, wherein the computer process further comprises: if the data is hot data, writing the data to top data tracks included in an interlaced magnetic recording scheme; and if the data is cold data, writing the data to bottom data tracks included in the interlaced magnetic recording scheme. ### Claim 5 (depends on 1) The one or more computer-readable storage media of claim 1, wherein the computer process further comprises: writing the data to a low density data track included between high-density data bands if the data is system data. ### Claim 6 One or more computer-readable storage media of a tangible article of manufacture encoding computer-executable instructions for executing on a computer system a computer process, the computer process comprising: selecting a power level for operating a heat-assisted magnetic recording (HAMR) head to record data on a storage medium based on an attribute of the data; and writing the data to the storage medium while operating the HAMR head exclusively at the selected power level, wherein the data is written to top data tracks included in an interlaced magnetic recording scheme responsive to a determination that at least one of a write frequency and write recency is higher than a predefined threshold; and wherein the data is written to bottom data tracks included in the interlaced recording scheme responsive to a determination that at least one of write frequency and write recency is lower than a predefined threshold. ### Claim 7 (depends on 6) The one or more computer-readable storage media of claim 6, wherein the attribute is at least one of a data type or a size of the data. ### Claim 8 (depends on 6) The one or more computer-readable storage media of claim 6, wherein the computer process further comprises: writing the data to a cache region on a storage medium, the cache region including data tracks storing data at a written track width that is greater than a written track width of other data tracks on the storage medium that are not included in the cache region. ### Claim 9 (depends on 6) The one or more computer-readable storage media of claim 6, wherein the storage medium includes data tracks with a track pitch that is different in different radial zones of the storage medium, and the computer process further comprises selecting a radial zone for storing the data based on the attribute. ### Claim 10 An apparatus comprising: a storage device controller configured to: select a power level for operating a heat-assisted magnetic recording (HAMR) head to write incoming data to a selected data track based whether the incoming data is cache data or non-cache data; and write cache data to a first radial zone of a storage medium at a first written track width and non-cache data to a second radial zone of the storage medium at one or more written track widths different from the first written track width. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the first written track width of the cache data is larger than the one or more written tracks of the non-cache data. ### Claim 12 (depends on 10) The apparatus of claim 10, wherein the storage device controller selects a higher power level for operating the HAMR head when the incoming data is cache data than when the incoming data is non-cache data. ### Claim 13 (depends on 10) The apparatus of claim 10, wherein cache data is written exclusively to alternating data tracks within the first radial zone. ### Claim 14 One or more computer-readable storage media of a tangible article of manufacture encoding computer-executable instructions for executing on a computer system a computer process, the computer process comprising: selecting a written track width of multiple written track widths for a storage location based on a current available storage capacity on a storage medium; and writing data to a low density data track included between high-density data bands responsive to a determination that the data is system data.