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Paper Abstract and Keywords
Presentation 2009-10-20 11:00
Prolongation of Lifetime and the Evaluation Method of Dependable SSD
Kensuke Tai, Masato Kitakami (Chiba Univ.) DC2009-23
Abstract (in Japanese) (See Japanese page) 
(in English) Storage capacity of solid-state drive (SSD) which has a large number of flash memories is rapidly increasing in recent years. Because high-density flash memories tend to have errors within their data easily, the reliability of SSD decreases even if using conventional error control method. Also, flash memory cells have a limited number of erasure cycles. Therefore, if many writes concentrate into the same part, the memory cells are broken and become unable to store the data. Wear-leveling is used for leveling the erasure cycles in a flash memory. The cells are broken and lifetime of memories is shortened because it is hard to catch the characteristics of the actual data. This paper proposes wear-leveling and error control method by using some flash memories in SSD in order to improve SSD reliability and lifetime. In the proposed method, error control is usually executed, and wear-leveling among the channels is executed when there is a bias in the erasure cycles. In addition, the execution frequency of wear-leveling is adjusted in consideration of deterioration of the cell. Evaluation of bit error rate and lifetime shows that the proposed method has high reliability and durability.
Keyword (in Japanese) (See Japanese page) 
(in English) solid-state drive (SSD) / flash memory / wear-leveling / error control code / lifetime prolongation / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 238, DC2009-23, pp. 7-12, Oct. 2009.
Paper # DC2009-23 
Date of Issue 2009-10-13 (DC) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF DC2009-23

Conference Information
Committee DC  
Conference Date 2009-10-20 - 2009-10-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To DC 
Conference Code 2009-10-DC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Prolongation of Lifetime and the Evaluation Method of Dependable SSD 
Sub Title (in English)  
Keyword(1) solid-state drive (SSD)  
Keyword(2) flash memory  
Keyword(3) wear-leveling  
Keyword(4) error control code  
Keyword(5) lifetime prolongation  
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Keyword(7)  
Keyword(8)  
1st Author's Name Kensuke Tai  
1st Author's Affiliation Chiba University (Chiba Univ.)
2nd Author's Name Masato Kitakami  
2nd Author's Affiliation Chiba University (Chiba Univ.)
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Speaker Author-1 
Date Time 2009-10-20 11:00:00 
Presentation Time 30 minutes 
Registration for DC 
Paper # DC2009-23 
Volume (vol) vol.109 
Number (no) no.238 
Page pp.7-12 
#Pages 6 
Date of Issue 2009-10-13 (DC) 

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