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Department of Electronics

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  1. Advanced Information Storage 06 Atsufumi Hirohata Department of Electronics 17:00 21/October/2013 Monday (AEW 105)

  2. Quick Review over the Last Lecture 1 / 2 reels : • Advantages of tape storages : • Fast data transfer speed • Low energy consumption • Recording methods : • Linear • Linear serpentine • Helical scan * http://www.wikipedia.org/; * http://itpro.nikkeibp.co.jp/article/lecture/20061220/257427/

  3. 06 Magnetic Tape Storage 2 • Fabrication processes • Areal density • Barium ferrites • Thermal stability

  4. Precise Positioning Data subsets are repeatedly stored in various tracks : * Surface smoothness Data track 1280 Tape width ~ 1.27 cm 20 μm Sapporo Tape length ~ 800 m Distribution in left / right Kagoshima * http://home.jeita.or.jp/

  5. LTO Tape Media Track width of LTO tape media : * • 12.65 mm wide tape / 1280 tracks • Track width : 8.1 mm Top ferromagnetic layer Bottom non-magnetic layer Smooth base film (PET, PEN or PA) 70 ~ 80 % thickness Back coating Servo-signal Servo-band 320 320 1280 320 320 Track width : 8.1 mm * http://home.jeita.or.jp/

  6. Tape Fabrication Process 1 Mixing process : * • Materials : • Ferromagnetic particles • Surfactant • Binder • Solvent Filtration Mixing Dispersion Magnetic fluid To coating process * http://home.jeita.or.jp/

  7. Tape Fabrication Process 2 Coating process : * Thickness measurement Drying Alignment Raw tape roll Base film Magnetic fluid Rolling Coating Winding * http://home.jeita.or.jp/

  8. Tape Fabrication Process 3 Calendar process : * Rolling Annealing + Pressurising Winding Smoothing the surface (< 10 nm) * http://home.jeita.or.jp/

  9. Tape Fabrication Process 4 Cutting process : * “Pancake” Rotating cutter Raw magnetic tape Winding Rolling * http://home.jeita.or.jp/

  10. Tape Fabrication Process 5 Test process : * Installation process : * Rolling Winding Rolling Cartridge Test by writing Servo-signals “Pancake” “Pancake” * http://home.jeita.or.jp/

  11. Areal Density Tape drives are catching up the HDDs : * * http://www.oracle.com/

  12. Recent Development In order to store 10 TB data : * * http://www.oracle.com/

  13. Bit Size Roadmap Data subsets are repeatedly stored in various tracks : * * http://www.oracle.com/

  14. New Media Smaller grain sizes required for better signal-to-noise ratios (SNR) : * • Barium ferrites (BaFe12O19) • Hexagonal platelet • Naturally stable oxide (no corrosion) * http://www.oracle.com/

  15. New BaFe12O19 New tape media is under development : * * http://www.oracle.com/

  16. Magnetic Degradation Measuring changes in demagnetization : * Stability equivalent to 30-year ambient storage * http://www.fujifilm.com/news/n100910.html

  17. Head Design Miniaturisation of the head components : * * http://home.jeita.or.jp/

  18. Areal Density Roadmap Consistent increase in areal density is anticipated : * * http://www.oracle.com/

  19. Tape Cartridge Capacity Roadmap Consistent increase in cartridge capacity is anticipated : * * http://www.oracle.com/

  20. Data Transfer Rate Roadmap Consistent increase in data transfer rate is anticipated : * * http://www.oracle.com/

  21. 35 TB Storage Demonstration In 2010, IBM and Fuji Film announced a record : * * http://www.zurich.ibm.com/news/10/storage.html

  22. Tape Storage Can Survive In order to fill the memory / storage access speed gap : * Storage class memory * http://home.jeita.or.jp/