| 摘要 |
A write DMA includes a write unit, a read unit and a parity generation unit. The read unit reads parity data from one of two NAND flashes storing the parity data therein. The parity generation unit generates parity data based on the read parity data and a plurality of stripes obtained by dividing user data. The write unit writes a stripe into any of a plurality of NAND flashes storing stripes therein, and writes generated parity data into the other NAND flash from which parity data is not read.
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