Patent ID: 9563552
Date: 2017-02-07
CPC Classifications: G06F,G11C

Claim:
1. A storage control device that controls a plurality of solid state drives including a first solid state drive, the storage control device comprising: a detector that detects a wear state of each of the plurality of solid state drives; a separation controller that separates a solid state drive of the plurality of solid state drives having a wear value, which represents a wear state, exceeding a first threshold; and an enlargement controller that, when the wear value of the first solid state drive exceeds a second threshold less than the first threshold, enlarges a difference in the wear value between the first solid state drive and another of the plurality of solid state drives by reducing a spare area of the first solid state drive, the spare area being used for replacing a defective block, wherein the enlargement controller determines that the wear value of the first solid state drive reaches the first threshold, when the reduced spare area of the first solid state drive has been exhausted by an increase in a number of defective blocks.