Patent ID: 9727265
Date: 2017-08-08
CPC Classifications: G06F

Claim:
1. A magnetic disk device, comprising: a disk comprising a first region and a second region; a head configured to record write data to the disk; a buffer configured to store the write data input from outside up to a first capacity; and a controller circuitry configured to obtain a first processing amount based on a time to write the write data from the buffer to the first region by the head and a second processing amount improved by writing the write data from the buffer to the first region, compare the first processing amount with the second processing amount, and determine whether the write data should be written from the buffer to the first region, based on a result of the comparison between the first processing amount and the second processing amount, wherein the controller circuitry writes the write data from the buffer to the second region if the controller circuitry does not write the write data from the buffer to the first region.