US 11,657,848 B1
Data access and logical mapping for magnetic disks
Robert Horn, Yorba Linda, CA (US)
Assigned to Western Digital Technologies, Inc., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Feb. 24, 2022, as Appl. No. 17/679,565.
Int. Cl. G11B 5/00 (2006.01); G11B 21/10 (2006.01); G11B 5/012 (2006.01)
CPC G11B 21/106 (2013.01) [G11B 5/012 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A Data Storage Device (DSD), comprising:
one or more magnetic disks, wherein each magnetic disk of the one or more magnetic disks includes at least one recording surface configured to store data;
one or more heads configured to read data from a respective recording surface of the one or more disks; and
circuitry configured to:
generate a segment mapping having a predetermined number of segment entries per recording surface of the one or more magnetic disks, wherein:
each segment entry corresponds to a data segment of the recording surface;
one or more segment entries include a first logical address corresponding to a first logical data block that begins in the corresponding data segment; and
at least one of the data segments is configured to store multiple logical data blocks;
locate a target segment entry in the segment mapping corresponding to the highest logical address less than or equal to a logical address for a read command; and
seek a head of the one or more heads to a beginning of a target data segment of a recording surface of the one or more magnetic disks corresponding to the target segment entry to perform the read command.