Invention Grant
- Patent Title: Self-prioritizing adaptive retry threshold adjustment
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Application No.: US16140192Application Date: 2018-09-24
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Publication No.: US10740178B2Publication Date: 2020-08-11
- Inventor: Xiaoheng Chen
- Applicant: Western Digital Technologies, Inc.
- Applicant Address: US CA San Jose
- Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
- Current Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
- Current Assignee Address: US CA San Jose
- Agency: Loza & Loza, LLP
- Agent Gabriel Fitch
- Main IPC: G06F11/00
- IPC: G06F11/00 ; G06F11/10 ; G06F11/14

Abstract:
Exemplary methods and apparatus are provided for read recovery in solid state devices (SSDs) with non-volatile memories (NVMs). In some examples, a dynamic priority read retry table (PRT) is generated for use with a static read retry table (RRT). In one aspect, a most recent successful read retry entry is determined from among the entries in the RRT. The most recent successful read retry entry is inserted as a first priority read retry entry within the PRT. A subsequent read recovery operation is performed using the first priority read retry entry of the PRT. In some examples, one or more neighboring values are selected for each entry in the PRT starting with the newest entry and proceeding chronologically to the oldest entry. The use of the PRT may help address die-to-die variations, block-to-block variations, or the transient changes that may occur in device physics within NVMs.
Public/Granted literature
- US20190108091A1 SELF-PRIORITIZING ADAPTIVE RETRY THRESHOLD ADJUSTMENT Public/Granted day:2019-04-11
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