Erase operation reattempt to recover misidentified bad blocks resulting from consecutive erase failures
US11152071B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 2020 |
| Grant date | Oct 19, 2021 |
| Priority date | — |
| Expiry date | May 27, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2211/5644
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Aspects of a storage device including a controller are provided which recovers misidentified bad blocks that fail to erase due to charge leakage from a previously programmed open block. The controller programs an open block, and attempts to erase a plurality of closed blocks following the programming of the open block. When the closed blocks fail to erase, the controller marks the closed blocks as bad blocks. The controller then determines whether a number of consecutive erase failures after programming the open block meets a threshold, in response to which the controller resets a die including the closed blocks and reattempts to erase the closed blocks. The controller then unmarks as bad blocks the closed blocks which successfully erased in response to the re-attempt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.