# US 8,786,985 B1 · System, method and apparatus for storage architecture for bit patterned media using both erase band and shingled magnetic recording > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,985 B1 - Document ID: US8786985B1 - Status: Granted - Kind: B1 - Application number: 13/854,621 - Filed: 2013-04-01 - Granted: 2014-07-22 - Earliest claimed: 2010-10-26 - Assignees: HGST Netherlands B.V. - Applicants: HGST Netherlands B.V. - Inventors: Michael K. Grobis; Hans J. Richter - Web page: https://patentgrep.com/patent/US8786985B1 ## CPC - G11B 5/746: {Bit Patterned record carriers, wherein each magnetic isolated data island corresponds to a bit} - G11B 5/012: Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) - G11B 20/1217: {on discs} - G11B 2020/1294: {Increase of the access speed} - G11B 2220/2516: Hard disks - G11B 2220/252: Patterned or quantised magnetic media, i.e. bits are stored in predefined single domain elements - 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 Storage architecture for bit patterned media uses both erase band and shingled magnetic recording. A hard disk drive may comprise a disk having bit patterned media with a plurality of data tracks arrayed in architecture pages having at least one of erase band mode (EBM), shingled mode (SM) and unallocated space. An actuator has a head for writing data to the data tracks of the bit patterned media. A control system monitors, reallocates and reconfigures the architecture pages from EBM, SM or unallocated space to a different one of EBM, SM or unallocated space to enhance performance of the hard disk drive. ## Claims ### Claim 1 A hard disk drive, comprising: a disk having bit patterned media with a plurality of data tracks arrayed in architecture pages having at least one of erase band mode (EBM), shingled mode (SM) and unallocated space; an actuator having a head for writing data to the data tracks of the bit patterned media; and a control system that monitors, reallocates and reconfigures the architecture pages from EBM, SM or unallocated space to a different one of EBM, SM or unallocated space to enhance performance of the hard disk drive. ### Claim 2 (depends on 1) A hard disk drive according to claim 1, wherein each of the architecture pages comprises a group of adjacent data tracks spanning one or more sectors. ### Claim 3 (depends on 1) A hard disk drive according to claim 1, wherein a write width of the head spans at least two data tracks. ### Claim 4 (depends on 1) A hard disk drive according to claim 1, wherein EBM stores data only on designated data tracks that are located at least a write width apart from each other, such that data tracks located between the designated data tracks form unused erase bands and are re-written every time an adjacent designated data track is written to. ### Claim 5 (depends on 1) A hard disk drive according to claim 1, wherein SM makes every data track available to store data and data is written sequentially on adjacent data tracks in successive order. ### Claim 6 (depends on 1) A hard disk drive according to claim 1, wherein the data tracks are arrayed in a hypertrack configuration. ### Claim 7 (depends on 6) A hard disk drive according to claim 6, wherein the data tracks collectively form a rectangular or staggered lattice. ### Claim 8 (depends on 6) A hard disk drive according to claim 6, wherein adjacent ones of the data tracks are circumferentially offset from each other. ### Claim 9 (depends on 6) A hard disk drive according to claim 6, wherein the data tracks are grouped and written to in sets of two data tracks such that the head writes data to both of said two data tracks simultaneously in a single pass. ### Claim 10 (depends on 6) A hard disk drive according to claim 6, wherein the hypertrack configuration with EBM has hypertracks that store data and are spaced apart from adjacent hypertracks by single data tracks that form unused erase bands. ### Claim 11 (depends on 6) A hard disk drive according to claim 6, wherein the hypertrack configuration with SM writes only one data track per write pass. ### Claim 12 (depends on 11) A hard disk drive according to claim 11, wherein SM makes every data track available to store data and data is written sequentially on adjacent data tracks in successive order. ### Claim 13 (depends on 6) A hard disk drive according to claim 6, wherein the hypertrack configuration with SM writes two data tracks write pass. ### Claim 14 (depends on 13) A hard disk drive according to claim 13, wherein the data tracks are arrayed in a staggered lattice and the head has a low curvature so that only one bit is written to at a time. ### Claim 15 (depends on 13) A hard disk drive according to claim 13, wherein the data tracks are arrayed in a rectangular lattice and the head has a high curvature so that only one bit is written to at a time.