Patent ID: 11954027
Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 14:
15. A controller circuitry for an asymmetric multi-actuator hard disk drive, wherein a first actuator assembly is configured to operate on a corresponding first number of first disk media surfaces and a second actuator assembly is configured to operate on a corresponding higher second number of second disk media surfaces, the controller circuitry storing or accessing one or more sequences of instructions which, when executed by one or more processors, cause performance of:
receiving from a host an input/output (TO) operation request addressed to a host-addressable first logical unit of memory assigned to the first actuator assembly;
based on a fixed data structure mapping logical memory addresses to physical memory locations of the first and second disk media surfaces, wherein the data structure comprises a first portion corresponding to the first logical unit and maps the first logical unit to physical memory locations of the first disk media surfaces and a portion of physical memory locations of the second disk media surfaces, sending a command to the second actuator assembly to execute at least a portion of the IO operation corresponding to the portion of physical memory locations of the second disk media surfaces mapped to the first logical unit of memory assigned to the first actuator assembly;
the second actuator assembly executing the portion of the TO operation corresponding to the portion of physical memory locations of the second disk media surfaces mapped to the first logical unit of memory assigned to the first actuator assembly; and
returning to the host a response identified as from the first logical unit.