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Software controlled cell bit-density to improve NAND flash lifetime

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3 Author(s)
Jimenez, X. ; Sch. of Comput. & Commun. Sci., Ecole Polytech. Fed. de Lausanne (EPFL), Lausanne, Switzerland ; Novo, D. ; Ienne, P.

Hybrid flash architectures combine static partitions in Single Level Cell (SLC) mode with partitions in Multi Level Cell (MLC) mode. Compared to MLC-only solutions, the former exploits fast and short random writes while the latter brings large capacity. On the whole, one achieves an overall tangible performance improvement for a moderate extra cost. Yet, device lifetime is an important aspect often overlooked. In this paper, we show how a dynamic SLC-MLC scheme provides significant lifetime improvement (up to 10 times) at no cost compared to any classic static SLC-MLC partitioning based on any state of the art Flash Translation Layer policy.

Published in:

Design Automation Conference (DAC), 2012 49th ACM/EDAC/IEEE

Date of Conference:

3-7 June 2012