Initially used in digital audio players, digital cameras, mobile phones, and USB memory sticks, flash memory may become the dominant form of enduser storage in mobile computing, either completely replacing the magnetic hard disks or being an additional secondary storage. We study the design of algorithms and data structures that can exploit the flash memory devices better. For this, we characte...

We propose an efficient hybrid automatic repeat request (HARQ) method that simultaneously achieves packet combining and resolution of the collisions random access identifiers (RAIDs) during retransmission in a non-orthogonal multiple (NOMA)-based system. Here, RAID functions as separator for received packets use same channel NOMA. An example this is scrambling code used 4G 5G systems. Since use...

Phase-change materials are suitable for data storage because they exhibit reversible transitions between crystalline and amorphous states that have distinguishable electrical and optical properties. Consequently, these materials find applications in diverse memory devices ranging from conventional optical discs to emerging nanophotonic devices. Current research efforts are mostly devoted to pha...

In this paper, we present an extension of the NVMain memory simulator. The objective is to facilitate computer architects to model complex memory designs for future computing systems in an accurate simulation framework. The simulator supports commodity memory models for DRAM as well as emerging non-volatile memories technologies such STT-RAM, ReRAM, PCRAM and hybrid models. The current publicly...

A Digital virtual Disk (DVD) random access memory (RAM) Redundant Array of Inexpensive Libraries (RAIL) optical storage system has been developed and tested at NTT Integrated Information & Energy Systems Laboratories. The RAIL storage system incorporates multiple DVD libraries that consist of dual DVD-RAM drives. Each DVD library utilizes a single mechanical robot picker for media loading and u...

There are numerous emerging nonvolatile memory technologies, which have been proposed as being capable of replacing hard disk drives (HDDs). In this paper, the prospects for these alternative technologies to displace HDDs in 2020 are analyzed. In order to compare technologies, projections were made of storage density and performance in year 2020 for both hard disks and the alternative technolog...

In a large-scale cluster system with many applications running on it, cluster-wide I/O access workload disparity and disk saturation on only some storage servers have been the severe performance bottleneck that deteriorates the system I/O performance. As a result, the system response time will increase and the throughput of the system will decrease drastically. In this paper, we present a load-...

The low cost per megabyte of optical disk and magnetic tape storage make these technologies particularly attractive for use in large capacity storage servers, including multimedia servers. However, these devices have performance problems that range from high costs for many optical drives to low performance and lack of random access in tape drives. We evaluate the performance on multimedia appli...

For many decades charge based storage memory technologies (DRAM, flash memory, and other) have been successfully scaled down to achieve higher speed and increased density of memory chips at lower bit cost. However, memories based on this storage principle are gradually approaching the physical limits of scalability. Although a new cell structure for DRAM has been developed by industry to overco...