Patent ID: 8825976

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: map a logical block address (LBA) to a data sector on the disk; detect a start of a host boot operation; execute a biased migration policy during a bias interval following the start of the boot operation, wherein the biased migration policy increases a likelihood of migrating the LBA to the NVSM; execute a normal migration policy after the bias interval; migrate the LBA to the NVSM in response to the normal and biased migration policies by: copying data stored in the data sector to a memory segment in the NVSM; and mapping the LBA to the memory segment in the NVSM; maintain a read counter for the LBA; and bias the migration of the LBA to the NVSM during the bias interval based on the read counter.