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Scientific Programming
Volume 2018, Article ID 8171096, 10 pages
Research Article

CRIM: Conditional Remapping to Improve the Reliability of Solid-State Drives with Minimizing Lifetime Loss

1College of Informatics, Korea University, Seoul, Republic of Korea
2Division of Computer Science and Engineering, Chonbuk National University, Jeonju, Republic of Korea
3School of Electrical and Electronics Engineering, Chung-Ang University, Seoul, Republic of Korea

Correspondence should be addressed to Chuck Yoo;

Received 3 May 2018; Revised 21 July 2018; Accepted 17 August 2018; Published 20 September 2018

Academic Editor: Marco Aldinucci

Copyright © 2018 Youngpil Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Solid-state drive (SSD) becomes popular as the main storage device. However, over time, the reliability of SSD degrades due to bit errors, which poses a serious issue. The periodic remapping (PR) has been suggested to overcome the issue, but it still has a critical weakness as PR increases lifetime loss. Therefore, we propose the conditional remapping invocation method (CRIM) to sustain reliability without lifetime loss. CRIM uses a probability-based threshold to determine the condition of invoking remapping operation. We evaluate the effectiveness of CRIM using the real workload trace data. In our experiments, we show that CRIM can extend a lifetime of SSD more than PR by up to 12.6% to 17.9% of 5-year warranty time. In addition, we show that CRIM can reduce the bit error probability of SSD by up to 73 times in terms of typical bit error rate in comparison with PR.