As the multimedia handheld devices using NAND flash memory as storage media is becoming more popular, the importance of the flash file system is increasing. Although there has been substantial research on file systems dedicated to NAND flash memory, little attention has been paid to legacy file systems running on top of NAND flash memory. In this paper, we propose an anti-fragmentation cluster ...

This paper focusses on the modelling of NAND Flash Memory technology, done as part of the POSIX filestore pilot study. This is the first known work on formal models of NAND Flash Memory. We describe recently published results, the current modelling activities, and sketch out our plans for future research in this area.

Nowadays, NAND Flash technology is everywhere, since it is the core of the code and data storage in mobile and embedded applications; moreover, its market share is exploding with Solid-State-Drives (SSDs), which are replacing Hard Disk Drives (HDDs) in consumer and enterprise scenarios. To keep the evolutionary pace of the technology, NAND Flash must scale aggressively in terms of bit cost. Whe...

In NAND flash memory, once a page program or block erase (P/E) command is issued to a NAND flash chip, the subsequent read requests have to wait until the timeconsuming P/E operation to complete. Preliminary results show that the lengthy P/E operations may increase the read latency by 2x on average. As NAND flashbased SSDs enter the enterprise server storage, this increased read latency caused ...

This paper is to design a short-random request absorbing structure which can be constructed with volatile DRAM buffer and nonvolatile flash memory chips. Specifically, major weakness of NAND flash memory mostly comes from frequent short and random writes spreading in the whole logical address space, causing writing performance decrease. This phenomenon occurs because NAND flash memory does not ...

Adding flash memory to the storage hierarchy has recently gained a great deal of attention in both industry and academia. Decreasing cost, low power utilization and improved performance has sparked this interest. Flash reliability is a weakness that must be overcome in order for the storage industry to fully adopt flash for persistent storage in mission-critical systems such as high-end storage...

Sink nodes are the data centers of wireless sensor networks (WSNs), and the storage management scheme for such nodes is vital, particularly in applications such as wireless multimedia sensor networks that involve the collection of massive amounts of data. NAND flash memory is often employed in sink nodes because of its excellent characteristics. Because the lifetime of NAND flash memory is high...

In this paper, we describe the design and implementation of a high precision real time NAND simulator called Copycat that runs on a commodity multi-core desktop environment. This NAND simulator facilitates the development of embedded flash memory management software such as the flash translation layer (FTL). The simulator also allows a comprehensive fault injection for testing the reliability o...

Recently, many storage systems use SSD based on NAND flash memory, which has many advantages such as low power, low access latency and high reliability. However, NAND flash memory has disadvantages such as erase-beforeprogram, limited P/E cycle, and unbalanced operation latency, compared to conventional magnetic disks. To solve these problems, many works mainly adopt FTL with garbage collection...

NAND flash-based Solid State Drives (SSDs), which are widely used from embedded systems to enterprise servers, are enhancing performance by exploiting the parallelism of NAND flash memories. To cope with the performance improvement of SSDs, storage systems have rapidly adopted the host interface for SSDs from Serial-ATA, which is used for existing hard disk drives, to high-speed PCI express. Si...