Method and device for managing physical blocks in nand flash memory, and ssd equipment
A management method and technology of physical blocks, applied in the field of SSD devices, can solve the problems that affect the security and stability of data storage, the data retention ability is not improved, and the storage information is aggravated, so as to reduce the risk of data loss and improve security and stability. performance, reducing data loss
Active Publication Date: 2022-05-17
DERA CO LTD
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When the NAND flash memory unit is in the erasing state, especially the general situation that the entire Block is in the erasing state, it indicates that the current Block is a Block that has not yet written data. When these Blocks in the erasing state are at a certain ambient temperature ( Generally, the ambient temperature of SSD is relatively high) and after a period of time (that is, after self-recovery), after erasing and programming operations are performed to write data again, the data retention ability of the Block will not improve, but will become worse. This exacerbates the risk of storing information errors, affecting the security and stability of data storage
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[0040] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0041] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more o...
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Embodiments of the present invention provide a method, device, and SSD device for managing physical blocks in NAND flash memory. The method includes: obtaining the state of each physical block in NAND flash memory; Physical block; judging whether the storage data in the physical block in the programming state is marked as useless data; if the storage data in the physical block in the programming state is marked as useless data, then the current physical block is recorded as the first target physical block ; Keep the programming state of the first target physical block unchanged, and perform an erase operation on the first target physical block until data writing is performed on the first target physical block. The management method, device and SSD device of the physical block in the NAND flash memory proposed by the present invention can avoid the negative impact of the self-recovery effect produced by the long-term placement of the physical block in the erased state on subsequent data storage after writing, and can be better. The physical block is protected to improve the security and stability of data storage.
Description
technical field [0001] The invention relates to the technical field of data storage, in particular to a method and device for managing physical blocks in a NAND flash memory and SSD equipment. Background technique [0002] NAND flash memory has become the mainstream non-volatile memory due to its high performance, low power consumption, small size, high stability and compatibility with silicon technology. It has been widely used in consumer, enterprise and industrial control markets. The product form includes SSD (Solid State Drives, solid state drive). Among them, NAND flash memory can be composed of a large number of Blocks (physical blocks, which can also be called data blocks), and physical blocks are the basic units of NAND flash memory for erasing operations. Numerous storage units. [0003] When the SSD master is doing block management, it usually erases the blocks that are not in use or will be used to facilitate the subsequent writing of information into these blo...
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IPC IPC(8): G06F3/06
CPCG06F3/064G06F3/0652G06F3/0679G06F3/0614G06F3/0619Y02D10/00
Inventor 张易孙丽华薛红军张建涛
Owner DERA CO LTD