Information storage by means of magnetic media is one of the oldest technologies for data recording, since the early prototype of magnetic wire recorder, the ‘‘telegraphone’’, was made by the Danish engineer Valdemar Paulsen in 1898. Magnetic media became very popular in the mid-1900s, with analog recording on audio and video tapes being developed; a milestone was the first digital device for m...

1 Designing Hierarchical Storage Systems for Interactive On-Demand Video Services S.-H. Gary Chan Fouad A. Tobagi Department of Electrical Engineering Stanford University Stanford, CA 94305 Abstract|A hierarchical storage system achieves scalable storage in providing on-demand video services. In such a system, video les are stored in a tertiary level (such as a library or jukebox), and transfer...

Drive-Managed SMR (Shingled Magnetic Recording) disks offer a plug-compatible higher-capacity replacement for conventional disks. For non-sequential workloads, these disks show bimodal behavior: After a short period of high throughput they enter a continuous period of low throughput. We introduce ext4-lazy1, a small change to the Linux ext4 file system that significantly improves the throughput...

Patterned magnetic nanowires are extremely well suited for data storage and logic devices. They offer non-volatile storage, fast switching times, efficient operation and a bistable magnetic configuration that are convenient for representing digital information. Key to this is the high level of control that is possible over the position and behaviour of domain walls (DWs) in magnetic nanowires. ...

The large storage requirements of many commerical and scientiic applications cannot be met by magnetic disks due to their high cost and low storage density. Consequently, cheaper and more dense tertiary storage systems are being intergrated into the storage hierarchies of these applications. Although tertiary storage can accomodate large amounts of data, the access latency is very high due to t...

Both magnetic wire and acetate-based magnetic tape were used in the audio industry. Welsh and Lukoff [lj describe the early use of metal tape for digital magnetic recording. Acetate-based tape was used for digital recording by Raytheon at a relatively low tape velocity, as reported by Bloch [2]. At IBM it was decided to pursue an acetate-based plastic magnetic tape for computer input,‘ output b...

Envisioning a new generation of sensor network applications in healthcare and workplace safety, we seek mechanisms that provide timely and reliable transmissions of mission-critical data. Inspired by the physics in magnetism, we propose a simple diffusion-based data dissemination mechanism, referred to as the magnetic diffusion (MD). In that, the data sink, functioning like the magnet, propagat...

A number of recent technological trends have made data intensive applications such as continuous media (audio and video) servers a reality. These servers store and retrieve a large volume of data using magnetic disks. Servers consisting of multiple nodes and large arrays of heterogeneous disk drives have become a fact of life for several reasons. First, magnetic disks might fail. Failed disks a...