A superblock-based flash translation layer for NAND flash memory
EMSOFT '06 Proceedings of the 6th ACM & IEEE International conference on Embedded software
A design for high-performance flash disks
ACM SIGOPS Operating Systems Review - Systems work at Microsoft Research
A flash-memory based file system
TCON'95 Proceedings of the USENIX 1995 Technical Conference Proceedings
A space-efficient flash translation layer for CompactFlash systems
IEEE Transactions on Consumer Electronics
BPLRU: a buffer management scheme for improving random writes in flash storage
FAST'08 Proceedings of the 6th USENIX Conference on File and Storage Technologies
Disk schedulers for solid state drivers
EMSOFT '09 Proceedings of the seventh ACM international conference on Embedded software
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Today, flash memory is widely used for various kinds of products. Unlike a hard disk, it has neither mechanical parts nor seek-delay. Therefore, a user may expect steady performance under disk fragmentation in flash storage. However, most commercial products do not satisfy this expectation. For example, a SDMMC card can be written in 18.7Mbytes/sec speed sequentially, but its write speed is slowed down to 3.2Mbytes/sec when it is seriously fragmented. It is only 18% of the original performance. In this paper, we analyze the reason for performance degradation in a flash disk, and propose an FTL level optimization technique, named the page padding method, to lessen the fragmentation effect. We applied the technique to the Log-block FTL algorithm and showed that it can enhance write performance by 150% in a severely fragmented flash disk.