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Noh, Sam H.
NECSST(Next-generation Embedded/Computer System Software Technology) Lab
Research Interests
  • Operating system, flash memory, SSD, persistent memory

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Space-efficient flash translation layer for CompactFlash systems

Cited 240 times inthomson ciCited 431 times inthomson ci
Title
Space-efficient flash translation layer for CompactFlash systems
Author
Kim, JesungKim, Jong MinNoh, Sam H.Min, Sang LyulCho, Yookun
Keywords
flash memory; NAND-type flash memory; FTL; CompactFlash; address translation
Issue Date
2002-05
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON CONSUMER ELECTRONICS, v.48, no.2, pp.366 - 375
Abstract
Flash memory is becoming increasingly important as nonvolatile storage for mobile consumer electronics due to its low power consumption and shock resistance. However, it imposes technical challenges in that a write should be preceded by an erase operation, and that this erase operation can be performed only in a unit much larger than the write unit. To address these technical hurdles, an intermediate software layer called a flash translation layer (FTL) is generally employed to redirect logical addresses from the host system to physical addresses in flash memory. Previous approaches have performed this address translation at the granularity of either a write unit (page) or an erase unit (block). In this paper, we propose a novel FTL design that combines the two different granularities in address translation. This is motivated by the idea that coarse grain address translation lowers resources required to maintain translation information, which is crucial in mobile consumer products for cost and power consumption reasons, while fine grain address translation is efficient in handling small size writes. Performance evaluation based on trace-driven simulation shows that the proposed scheme significantly outperforms previously proposed approaches.
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DOI
10.1109/TCE.2002.1010143
ISSN
0098-3063
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