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Storage device

A technology of storage device and storage area, which is applied in the direction of information storage, static memory, digital memory information, etc., and can solve the problems of many rewritable times and small storage capacity

Active Publication Date: 2008-11-19
BUFFALO CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, SLC-type flash memory has the characteristics of high-speed operation and high rewritable times, but its storage capacity is smaller than that of MLC-type.

Method used

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no. 1 example

[0033] FIG. 1 is an explanatory diagram showing a schematic configuration of a storage device 10 as an embodiment of the present invention. The storage device 10 of this embodiment is connected to a host device 80 represented by a computer via a USB interface, and is used as an external storage device. The host device 80 formats the storage device 10 with a predetermined file system (FAT16, FAT32, etc.) to read and write data.

[0034] As shown in the figure, the storage device 10 includes a main controller 20, and additionally includes a first storage unit 30, a second storage unit 40, a third storage unit 50, and a first storage unit 30 connected to the main controller 20 and each having a NAND flash memory. Four memory cells 60 .

[0035] The first storage unit 30 includes a binary memory 31 which is an SLC type NAND flash memory. In addition, the first storage unit 30 includes a first unit controller 32 that controls the binary memory 31 according to the electrical chara...

no. 2 example

[0072] FIG. 5 is an explanatory diagram showing a schematic configuration of a storage device according to a second embodiment of the present invention. As shown in the figure, the storage device 110 of this embodiment includes: a main controller 20 , a first storage unit 30 installed with a binary memory 31 , and a second storage unit 40 installed with a multi-valued memory 41 . Like the first embodiment, the main controller 20 includes a bus conversion circuit 21 and a unit management circuit 122 . Among them, the unit management circuit 122 of this embodiment has the function of switching the target for reading and writing data between the first storage unit 30 and the second storage unit 40 according to the address, data, and command specified from the host device 80 .

[0073] FIG. 6 is an explanatory diagram showing the concept of memory cell switching control performed by the cell management circuit 122 . In FIG. 6, the storage area UA2 of the storage device 110 as a w...

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Abstract

The invention provides a storage device sufficiently acting the advantages of the SLC-type flash memory and the MLC-type flash memory. The storage device includes: a binary flash memory that has a first storage area and a capacity of storing two values per each cell; a multivalued flash memory that has a second storage area and a capacity of storing at least three values per each cell; and a controller configured to arrange the first storage area ahead of the second storage area, logically combine the first storage area with the second storage area to form a single combined storage area, and perform data reading and data writing from and into the combined storage area. Data management information is stored in a head of the combined storage area according to a predetermined file system.

Description

technical field [0001] The present invention relates to a storage device that stores data used in computers or various electronic devices. Background technique [0002] In recent years, memory cards represented by compact flash (registered trademark, the same hereinafter) and USB flash drives (USB flash drives) have been widely used as external storage devices for computers. These external storage devices incorporate a flash memory which is a rewritable nonvolatile ROM. There are flash memories called SLC (Single Level Cell, single-level cell) type and MLC (Multi Level Cell, multi-level cell) type (see, for example, Patent Document 1 below). [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2002-8380. [0004] SLC-type flash memory is a memory that has been widely used all the time, and is a memory that can store information of 1 bit per single cell (hereinafter also referred to as "binary memory"). In contrast, an MLC type memory cell is a memory capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C7/10G06F12/10
CPCG11C2211/5641
Inventor 荒川忠史
Owner BUFFALO CORP LTD
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