Magnetic disk device and parity management method

The invention discloses a magnetic disk device and a parity management method. Provided are a magnetic disk device and a parity management method capable of generating a parity without hindering the processing of a received instruction. A magnetic disk device (1) is provided with a disk (DK), a storage unit, a first determination unit (62a), and a first parity management unit (63a). A first determination unit (62a) determines the presence or absence of an unexecuted command. A first parity management unit (63a) retrieves a first parity region from the storage unit after the first determination unit (62a) determines that there is no command that has not been executed. When a first parity region, which is an invalid parity region, is detected, a first parity management unit (63a) generates a first parity on the basis of first data in a first data region, and writes the first parity to the first parity region. 本公开磁盘装置及奇偶校验位管理方法。提供能够不妨碍接收的指令的处理地生成奇偶校验位的磁盘装置及奇偶校验位管理方法。磁盘装置(1)具备盘(DK)、存储部、第1判断部(62a)以及第1奇偶校验位管理部(63a)