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ACM Transactions on Storage (TOS), Volume 6 Issue 2, July 2010

Differential RAID: Rethinking RAID for SSD reliability
Mahesh Balakrishnan, Asim Kadav, Vijayan Prabhakaran, Dahlia Malkhi
Article No.: 4
DOI: 10.1145/1807060.1807061

SSDs exhibit very different failure characteristics compared to hard drives. In particular, the bit error rate (BER) of an SSD climbs as it receives more writes. As a result, RAID arrays composed from SSDs are subject to correlated failures. By...

A strategy to emulate NOR flash with NAND flash
Yuan-Hao Chang, Jian-Hong Lin, Jen-Wei Hsieh, Tei-Wei Kuo
Article No.: 5
DOI: 10.1145/1807060.1807062

This work is motivated by a strong market demand for the replacement of NOR flash memory with NAND flash memory to cut down the cost of many embedded-system designs, such as mobile phones. Different from LRU-related caching or buffering studies,...

Extract and infer quickly: Obtaining sector geometry of modern hard disk drives
Jongmin Gim, Youjip Won
Article No.: 6
DOI: 10.1145/1807060.1807063

The modern hard disk drive is a complex and complicated device. It consists of 2--4 heads, thousands of sectors per track, several hundred thousands of tracks, and tens of zones. The beginnings of adjacent tracks are placed with a certain angular...

SOPA: Selecting the optimal caching policy adaptively
Yang Wang, Jiwu Shu, Guangyan Zhang, Wei Xue, Weimin Zheng
Article No.: 7
DOI: 10.1145/1807060.1807064

With the development of storage technology and applications, new caching policies are continuously being introduced. It becomes increasingly important for storage systems to be able to select the matched caching policy dynamically under varying...