1. A magnetic disk apparatus having a RAID configuration in which the same data is written on two disks, comprising: a read command issuance section that selects a given algorism from a plurality of different algorisms with respect to the data stored in the disks and issues read commands to the data stored in the two disks, respectively, according to the selected algorithm; and a data acquisition section that adopts, as read data, the data that has been read first by the read commands that the read command issuance section has issued to the two disks.