Invention Grant
- Patent Title: End of life prediction based on memory wear
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Application No.: US15491596Application Date: 2017-04-19
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Publication No.: US10210943B2Publication Date: 2019-02-19
- Inventor: Neil Richard Darragh , Sergey Anatolievich Gorobets , Liam Michael Parker
- Applicant: SanDisk Technologies LLC
- Applicant Address: US TX Plano
- Assignee: SanDisk Technologies LLC
- Current Assignee: SanDisk Technologies LLC
- Current Assignee Address: US TX Plano
- Agency: Loza & Loza, LLP
- Agent Gabriel Fitch
- Main IPC: G11C16/06
- IPC: G11C16/06 ; G11C16/34 ; G11C29/52 ; G11C29/00 ; G11C29/50 ; G06F11/07

Abstract:
A memory system or flash card may include a mechanism for memory cell measurement and analysis that independently measures/predicts memory wear/endurance, data retention (DR), read disturb, and/or remaining margin. These effects may be independently quantified by analyzing the state distributions of the individual voltage levels of the cells. In particular, a histogram of cell voltage distributions of the memory cells can be analyzed to identify signatures for certain effects (e.g. wear, DR, read disturb, margin, etc.). Those measurements may be used for block cycling, data loss prediction, or adjustments to memory parameters. Pre-emptive action at the appropriate time based on the measurements may lead to improved memory management and data management. That action may include calculating the remaining useful life of data stored in memory, cycling blocks, predicting data loss, trade-off or dynamic adjustments of memory parameters.
Public/Granted literature
- US20170221573A1 END OF LIFE PREDICTION BASED ON MEMORY WEAR Public/Granted day:2017-08-03
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