Hitachi, Ltd.

Tatsuya Ninomiya

Kazuo Tanaka

The present invention comprises a CHAwhich transmits/receives data to/from an external device, a DKAwhich transmits/receives data to/from an HDD unit, a primary cache unitwhich has a primary cache memory, a secondary cache unitwhich is installed between the primary cache unitand the DKAand has a secondary cache memory, a CCPwhich stores write target data received by the CHAin the primary cache memory, and a CCPwhich stores the write target data in the secondary cache memory, and transfers the write target data stored in the secondary cache memoryto the DKA

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Odawara, Japan

Tatsuya Ninomiya