Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Reexamination Certificate
2005-01-14
2008-05-27
Kim, Hong (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
C711S159000, C711S113000, C711S118000, C711S162000, C711S112000
Reexamination Certificate
active
07380064
ABSTRACT:
The present invention improves the performance of a storage device by utilizing the special features of different types of volumes. The control part of the storage device constructs a virtual volume in the memory. The virtual volume is constructed by a low-speed volume and a high-speed volume, and has the same size capacity as the low-speed volume. When the application program of the host requests the updating of data, the write data is respectively written into low-speed and high-speed volumes, and a life tag that indicates the storage period is set beforehand in the virtual volume. When the storage period has elapsed, the data is erased from the high-speed volume. The data in the low-speed volume is maintained “as is”. While the data is held in the high-speed volume, access from the host is processed utilizing the data in the high-speed volume.
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Ishii Kenji
Murotani Akira
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Kim Hong
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