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Method and device for read disturbance detection and processing

A read interference and interference technology, applied in the field of read interference detection and processing, can solve problems such as taking a long time

Active Publication Date: 2021-07-16
WESTERN DIGITAL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this methodology can take a long time before the location is actually scanned

Method used

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  • Method and device for read disturbance detection and processing
  • Method and device for read disturbance detection and processing
  • Method and device for read disturbance detection and processing

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Embodiment Construction

[0015] The present disclosure provides methods and apparatus for more accurately determining that a page or block is a potential source of read disturb so that relocation of blocks is more likely to be performed only when necessary. Accurate NVM addresses can be provided based on potential read disturbers or active detection of disturbers. By directly reading the surrounding potential victim objects, the ECC error counts for the victim objects can be obtained. If the ECC error count is sufficiently high, the present method and apparatus provide for relocation of only those pages that are affected (eg, pages with sufficiently high errors). In this way, only a portion of the block has to be relocated, and the appropriate data is relocated. Furthermore, there is no need to wait for other processing to relocate data, which could result in data loss such as that described above in connection with passive BGMS scanning. The presently disclosed active process of scanning surroundin...

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Abstract

Aspects of the present disclosure provide methods and apparatus for handling read disturb and block errors in non-volatile memory (NVM) devices. Error levels for both the disturber page that caused the read disturb error and the error levels for adjacent victim pages are obtained. The error level of the victim page is compared to a predetermined threshold error level to determine whether the victim page is experiencing a high level of bit errors. If so, the error level of the disturber page is compared to the error level of the victim page to determine whether a read disturb error actually occurred due to a host read of the disturber page. By looking at both disturber and victim error levels, a more accurate determination of read disturb errors can be obtained, resulting in fewer unnecessary relocations of pages and blocks within NVM for mitigating read disturb effects.

Description

technical field [0001] The present disclosure generally relates to Solid State Drives (SSDs), and more particularly, to methods and apparatus for read disturb detection and processing. Background technique [0002] Solid-state drives (SSDs) combined with non-volatile memory (NVM) are often used to replace or supplement conventional spinning hard drives for mass storage in various consumer electronics products. These non-volatile memories may include one or more flash memory devices, such as NAND flash memory, and the flash memory devices may be logically divided into blocks, each block further logically divided into addressable pages. These addressable pages can be any of various sizes (e.g., 512 bytes, 1 kilobyte, 2 kilobytes, 4 kilobytes), which may or may not match the size used by the host computing device The logical block address size. [0003] When cells or pages in a block are read from NVM, the process of reading a page may have adverse effects on other pages in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11C29/18G11C29/42G11C16/34
CPCG11C16/3418G11C29/18G11C29/42G11C2029/0411G11C16/26G11C16/3427G11C16/3431G06F3/0619G06F3/064G06F3/0679G06F11/1068G11C29/52G06F3/0647
Inventor R.D.巴恩特A.G.科梅蒂刘海宁罗文阳
Owner WESTERN DIGITAL TECH INC