Patent ID: 8560759

Claim:
A hybrid drive comprising: a disk comprising a plurality of data sectors; a head actuated over the disk; a non-volatile semiconductor memory (NVSM) comprising a plurality of memory segments; and control circuitry operable to: maintain a read frequency of a first logical block address (LBA), wherein the first LBA is mapped to a physical block address (PBA); when the read frequency of the first LBA exceeds a threshold and the PBA is assigned to a data sector of the disk, copy first data stored in the data sector to a memory segment of the NVSM; when the read frequency of the first LBA exceeds a threshold and the PBA is assigned to a memory segment of the NVSM, copy first data stored in the memory segment to a data sector of the disk; receive a read command to read the first LBA and a second LBA, wherein the second LBA is mapped to a first PBA assigned to a data sector on the disk and to a second PBA assigned to a memory segment of the NVSM; and execute a rotational position optimization algorithm (RPO) in order to select the disk for reading the first LBA and the NVSM for reading the second LBA.