# US 2016/0148643 A1 · 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 2016/0148643 A1 - Document ID: US20160148643A1 - Status: Published application - Kind: A1 - Application number: 14/688,598 - Filed: 2015-04-16 - Published: 2016-05-26 - 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/US20160148643A1 ## 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 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 write attribute of data to be recorded at the storage location. ### Claim 2 (depends on 1) The one or more computer-readable storage media of claim 1, wherein the computer process further comprises: selecting a power level for operating a heat-assisted magnetic recording (HAMR) head to write the data to the storage location based on the write attribute. ### Claim 3 (depends on 1) The one or more computer-readable storage media of claim 1, wherein the write attribute is at least one of write frequency or write recency. ### Claim 4 (depends on 2) The one or more computer-readable storage media of claim 2, wherein selecting the power level for operating the HAMR head further comprises: selecting a higher power if the data is cache data than if the data is non-cache data. ### Claim 5 (depends on 2) The one or more computer-readable storage media of claim 2, wherein selecting the power level for operating HAMR head further comprises: selecting between at least two power levels associated with separate regions of a magnetic medium. ### Claim 6 (depends on 1) The one or more computer-readable storage media of claim 1, wherein the storage location is 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 7 (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 8 (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 9 One or more computer-readable storage media 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. ### Claim 10 (depends on 9) The one or more computer-readable storage media of claim 9, wherein the attribute is at least one of a data type or a size of the data. ### Claim 11 (depends on 9) The one or more computer-readable storage media of claim 9, 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 12 (depends on 9) The one or more computer-readable storage media of claim 9, wherein selecting the power level further comprises: selecting a higher power if the data is cache data than if the data is non-cache data. ### Claim 13 (depends on 9) The one or more computer-readable storage media of claim 9, 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 14 (depends on 9) The one or more computer-readable storage media of claim 9, further comprising: writing the data to a low density data track included between high-density data bands if the data is system data. ### Claim 15 (depends on 9) The one or more computer-readable storage media of claim 9, wherein the storage medium includes data tracks with a track pitch that is different in different radial zones of the storage medium, and the storage device controller selects a radial zone for storing the data based on the attribute. ### Claim 16 Apparatus comprising: a storage device controller configured to 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 of the storage medium at one or more written track widths different from the first track width. ### Claim 17 (depends on 16) The apparatus of claim 16, 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 18 (depends on 16) The apparatus of claim 16, wherein the storage device controller is further configured to select a power level for operating a heat-assisted magnetic recording (HAMR) head to write the data to the storage location based whether incoming data is cache data or non-cache data. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the storage device controller selects a higher power level for operating the HAMR head when the data is cache data than when the data is non-cache data. ### Claim 20 (depends on 16) The apparatus of claim 16, wherein cache data is written exclusively to alternating data tracks within the first radial zone. ### Claim 21 One or more computer-readable storage media encoding computer-executable instructions for executing on a computer system a computer process, the computer process comprising: a storage device controller configured to select one of multiple written track widths for a storage location based on a current available storage capacity on a storage medium.