Optical data storage media

Abstract

in this paper, we review many of the technical issues that must be addressed in developing high-quality optical disk recording media. The geometric design of tracking grooves and embossed data on the disk substrate must be optimized to the characteristics of the optical drive to support robust data seeking, track following, and data addressing. To ensure adequate recording performance and drive compatibility, we have used modeling to optimize the media thin-film structure for proper optical, thermal, and magnetic characteristics. Because low substrate birefringence is a necessary media characteristic for high recording densities, we discuss measurements which assess whether birefringence has been adequately controlled in disk production. Testing is used throughout media development and manufacture to measure that the quality goals of the design are achieved. The mechanical integrity of the disk and its cartridge, particularly for autoload libraries, is confirmed by load/unload stress testing. Media life and data archivability are established by a combination of time-zero and accelerated life stress tests of media mechanical and recording performance. This attention to a broad range of technical details is essential to ensure reliable storage of data on removable optical disk media.

Photopolymer materials for holographic data storage applications

“…The rate at which Eq's (9) and (10) occur is incorporated as R d in Eq (2). In the presence of the monomer the free radical can undergo two reactions.…”

“…Many materials are being investigated for use in data storage systems, such as organic and inorganic photorefractives, and photosensitive polymers, however most have significant disadvantages [2][3][4][5][6] . For example, thick layers of photorefractive polymers have yet to be developed thus limiting information storage capacity.…”

A Systematic Mapping of the Proposition of Benchmarks in the Software Testing and Debugging Domain

“…In the context of STD techniques, benchmarks comprise a set of programs, faulty versions of these programs, a suite of test cases, and bug reports or logs of test case executions. They can be used to evaluate the effectiveness of those techniques to achieve their aims, such as finding a fault [17]. A remarkable and popular instance of a benchmark for that context is Defects4J, which is made up of six Java programs with 438 real bugs and test cases that cover the faulty code.…”

Experimental study of the influence of raw material impurities on yellowness index of transesterification polycarbonate

“…Although work in the field of polycarbonates is heading into its sixth decade, a large amount of research is still necessary to fully develop our understanding of this industrially important material. Since the 80s, a great attention has been paid to these transparent polymers due to their intrinsic properties as a substrate for optical data storage media 1–3. Given the current trends observed in optical data storage systems, it seems that fundamental knowledge on the relationships between structure and product properties will be indispensable for a proper manufacture of the next generation of these materials.…”