Long-term digital preservation is an important issue in data storage area. For years, magnetic media based solutions, such as tape and hard disk drive （HDD） based archive systems, monopolize the data archiving marke...Long-term digital preservation is an important issue in data storage area. For years, magnetic media based solutions, such as tape and hard disk drive （HDD） based archive systems, monopolize the data archiving market due to their high capacity and low cost. However, in the era of big data, rapidly increasing volume, velocity, and variety of data set bring numerous challenges to the archive systems in various aspects, such as capacity, cost, performance, reliability, power consumption, and so on. In recent years, high capacity optical media, such as bluray discs （BDs） and holographic discs, emerge with the revival of optical storage. Due to the natural simple construction of the optical media, the archive systems based on those optical media, e.g., BD library, demonstrate attractive properties, such as cost per bit, reliability, power consumption, and so on, thus become feasible options in long-term digital preservation. In this paper, we reviewed and compared both the magnetic and optical media based solutions for long-term digital preservation, followed by a summarization on techniques to improve the optical media based archive system.展开更多
This paper gives an overview of the research and development progress on Blu-Ray DiscTM （BD） rewritable/recordable media for more than 20 years. The writable BD media had been developed for consumer use like video-r...This paper gives an overview of the research and development progress on Blu-Ray DiscTM （BD） rewritable/recordable media for more than 20 years. The writable BD media had been developed for consumer use like video-recording/personal computer （PC） buck-up and professional use like broadcasting with increasing storage capacity and data rate. The key technology in each innovation was explained according to referenced papers.展开更多
For Ag alloy film used for the storage media, it is required to have heat-resistance, anti-constant temperature and anti-constant humidity characteristics, corrosion resistance, while high reflectivity over Al is main...For Ag alloy film used for the storage media, it is required to have heat-resistance, anti-constant temperature and anti-constant humidity characteristics, corrosion resistance, while high reflectivity over Al is maintained. An Ag alloy thin film (additive element Pd, Cu, P) was created on glass substrates, and various heat treatment was conducted. Then, fine structure was observed on this thin film using AFM, and fine structure evaluation of the inside was carried out by the in-plane diffractometry and X-ray diffractometry, and in addition, residual stress analysis was carried out. These results were compared and were examined, and fine structure and physical property in a metallic thin film were evaluated, and usefulness of evaluation method was verified.展开更多
基金This work was supported in part by the National Basic Research Program of China （No. 2011CB302303）, the National High Technology Research and Development Program of China （No. 2013AA013203）, the National Natural Science Foundation of China （Grant No. 60933002）, and the Fundamental Research Funds for Central Universities, Huazhong University of Science and Technology, （No. 2013KXYQ003）. This work was also supported by Key Laboratory of Data Storage System, Ministry of Education.
文摘Long-term digital preservation is an important issue in data storage area. For years, magnetic media based solutions, such as tape and hard disk drive （HDD） based archive systems, monopolize the data archiving market due to their high capacity and low cost. However, in the era of big data, rapidly increasing volume, velocity, and variety of data set bring numerous challenges to the archive systems in various aspects, such as capacity, cost, performance, reliability, power consumption, and so on. In recent years, high capacity optical media, such as bluray discs （BDs） and holographic discs, emerge with the revival of optical storage. Due to the natural simple construction of the optical media, the archive systems based on those optical media, e.g., BD library, demonstrate attractive properties, such as cost per bit, reliability, power consumption, and so on, thus become feasible options in long-term digital preservation. In this paper, we reviewed and compared both the magnetic and optical media based solutions for long-term digital preservation, followed by a summarization on techniques to improve the optical media based archive system.
文摘This paper gives an overview of the research and development progress on Blu-Ray DiscTM （BD） rewritable/recordable media for more than 20 years. The writable BD media had been developed for consumer use like video-recording/personal computer （PC） buck-up and professional use like broadcasting with increasing storage capacity and data rate. The key technology in each innovation was explained according to referenced papers.
文摘For Ag alloy film used for the storage media, it is required to have heat-resistance, anti-constant temperature and anti-constant humidity characteristics, corrosion resistance, while high reflectivity over Al is maintained. An Ag alloy thin film (additive element Pd, Cu, P) was created on glass substrates, and various heat treatment was conducted. Then, fine structure was observed on this thin film using AFM, and fine structure evaluation of the inside was carried out by the in-plane diffractometry and X-ray diffractometry, and in addition, residual stress analysis was carried out. These results were compared and were examined, and fine structure and physical property in a metallic thin film were evaluated, and usefulness of evaluation method was verified.
