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Department of Electronics Advanced Information Storage 06 Atsufumi Hirohata 17:00 21/October/2013 Monday (AEW 105)
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Quick Review over the Last Lecture Advantages of tape storages : Fast data transfer speed Low energy consumption Recording methods : Linear Linear serpentine Helical scan 1 / 2 reels : * http://itpro.nikkeibp.co.jp/article/lecture/20061220/257427/ * http://www.wikipedia.org/;
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06 Magnetic Tape Storage 2 Fabrication processes Areal density Barium ferrites Thermal stability
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Precise Positioning Data subsets are repeatedly stored in various tracks : * * http://home.jeita.or.jp/ Tape width ~ 1.27 cm Kagoshima Distribution in left / right Data track 1280 Tape length ~ 800 m Sapporo Surface smoothness 20 μ m
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LTO Tape Media Track width of LTO tape media : * 12.65 mm wide tape / 1280 tracks Track width : 8.1 m Smooth base film (PET, PEN or PA) 70 ~ 80 % thickness Back coating Bottom non-magnetic layer Top ferromagnetic layer Servo-band Servo-signal 320 1280 Track width : 8.1 m * http://home.jeita.or.jp/
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Tape Fabrication Process 1 Mixing process : * Magnetic fluid To coating process Materials : Ferromagnetic particles Surfactant Binder Solvent * http://home.jeita.or.jp/ Filtration Dispersion Mixing
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Tape Fabrication Process 2 Coating process : * Magnetic fluid Base film Raw tape roll * http://home.jeita.or.jp/ Winding Thickness measurement Drying Rolling Coating Alignment
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Tape Fabrication Process 3 Calendar process : * * http://home.jeita.or.jp/ Winding Rolling Annealing + Pressurising Smoothing the surface (< 10 nm)
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Tape Fabrication Process 4 Cutting process : * * http://home.jeita.or.jp/ Winding Rolling Raw magnetic tape Rotating cutter Pancake
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Tape Fabrication Process 5 Test process : * * http://home.jeita.or.jp/ Winding Rolling Pancake Test by writing Servo-signals Installation process : * Rolling Pancake Cartridge
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Areal Density Tape drives are catching up the HDDs : * * http://www.oracle.com/
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Recent Development In order to store 10 TB data : * * http://www.oracle.com/
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Bit Size Roadmap Data subsets are repeatedly stored in various tracks : * * http://www.oracle.com/
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New Media Smaller grain sizes required for better signal-to-noise ratios (SNR) : * * http://www.oracle.com/ Barium ferrites (BaFe 12 O 19 ) Hexagonal platelet Naturally stable oxide (no corrosion)
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New BaFe 12 O 19 New tape media is under development : * * http://www.oracle.com/
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Magnetic Degradation Measuring changes in demagnetization : * * http://www.fujifilm.com/news/n100910.html Stability equivalent to 30-year ambient storage
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Head Design Miniaturisation of the head components : * * http://home.jeita.or.jp/
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Areal Density Roadmap Consistent increase in areal density is anticipated : * * http://www.oracle.com/
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Tape Cartridge Capacity Roadmap * http://www.oracle.com/ Consistent increase in cartridge capacity is anticipated : *
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Data Transfer Rate Roadmap * http://www.oracle.com/ Consistent increase in data transfer rate is anticipated : *
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35 TB Storage Demonstration * http://www.zurich.ibm.com/news/10/storage.html In 2010, IBM and Fuji Film announced a record : *
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Tape Storage Can Survive In order to fill the memory / storage access speed gap : * * http://home.jeita.or.jp/ Storage class memory
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