Data storage device and method

Abstract

The invention provides a data storage device and a method, wherein, the data storage device comprises a memory control unit and three memories. The memory control unit comprises a security module anda logical-physical address configuration module, and receives a logical address and a writing data from a host under a writing operation; the security module is responsible for judging whether the logical address belongs to one of key physical addresses stored in a third memory, if so, a logical-physical address mapping table in a second memory is searched according to the logical address to obtain a key physical address; and then the logical-physical address configuration module configures a physical address laid aside in a first memory and stores the above writing data to the logical address, and updates the logical-physical address mapping table in the second memory. The invention is conducive to improving the security of data storage.

Description

technical field [0001] The invention relates to a data storage device and a used data storage method. Background technique [0002] In addition to disk hard disks, optical disks, etc., other data storage technologies have been developed today. Taking a solid state disk (Solid State Disc, SSD) as an example, NAND Flash (NAND flash memory) is used as a data storage unit, and a memory control unit is used to control the reading and writing of the NAND flash memory. Solid state drives are often used to replace traditional disk drive technology. [0003] figure 1 A data storage device 100 using NAND flash memory as a data storage unit is illustrated. The data storage device 100 includes a NAND flash memory 101 and a memory control unit 102, wherein the NAND flash memory 101 has a plurality of blocks (blocks, numbered as block 1 、block 2 ,..., block n ). Each of these blocks includes multiple pages (pages), for example, block block 1 That is, it includes multiple pages pag...

AI Technical Summary

Problems solved by technology

For example, the data at the invalid physical address generated by the overwriting action has not actually been erased, and since the logical address is mapped to a new physical address after overwriting, the invalid data at the invalid physical address loses its mapping with the logical address relationship, making it impossible for the host to track these invalid data

Accumulated over time, these invalid data may be scattered in multiple different blocks of the NAND flash memory 101, and these invalid data are likely to be restored by interested persons, which is a relatively large problem for file data with higher security requirements. security risks

In addition, during garbage collection, it may happen that the freed blocks still contain important data

For example, when ordinary garbage collection releases a block, only ordinary erasure is performed on the valid data on the block. However, ordinary erasure cannot guarantee that the invalid important data on it will not be restored by interested parties

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