Wear Unleveling under Unbalanced Page Endurance in NAND Flash25 Jun 2015
The start point of this paper is the observation that the various pages that constitute a block deteriorate at significantly different speeds. This paper use relief cycle to address this problem.
We define a relief cycle on a page the fact of not programming it between two erase cycles.
Two Relief Plan studied:
- The reactive approach use the correlation between a page position in a block and its endurance and relieve the weakest pages from the very first writes to the device.
- The proactive technique detect the weak pages on the go.
Results shows that the proactive technique is more efficient than the reactive one.