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MEMS-Based Storage Devices

MEMS-Based Storage Devices. Stuart Hostler COP 4810. Overview. Need for MEMS RAM-to-Disk Performance Gap What is MEMS? Implementation Approaches Cantilevered Beam Vs. Moving Media Moving Media Model Data Organization Physical Influencing Factors

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MEMS-Based Storage Devices

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  1. MEMS-Based Storage Devices Stuart Hostler COP 4810

  2. Overview • Need for MEMS • RAM-to-Disk Performance Gap • What is MEMS? • Implementation Approaches • Cantilevered Beam Vs. Moving Media • Moving Media Model • Data Organization • Physical Influencing Factors Bit Size, Access Velocity, Spring Stiffness, etc… • Performance Influencing Factors Seek time, Turnaround time, Power, Reliability, etc… • Applications

  3. Need for M.E.M.S • RAM-to-Disk Performance Gap • Disk Drives • Non-Volatile Memory

  4. What is MEMS? Microelectromechanical Systems(MEMS) • Very small-scale mechanical structures, fabricated on silicon chips using the same standard CMOS processes as other semiconductor devices.

  5. Implementation Approaches Cantilevered Beam Moving Media

  6. Data Organization (disk)

  7. Data Organization (MEMS)

  8. Physical Influences • Bit Size • Access Velocity • Sled Acceleration • Spring Stiffness • Number of Sleds • Number of Active Tips • Error Rates

  9. Physical Influences • Bit Size • Areal density of the storage media • Resolution of the probe tips • Access Velocity • Bound by effective actuator force • Increased Acceleration/Deceleration Time

  10. Physical Influences cont… • Sled Acceleration • Actuator Force • Spring Stiffness • Sled Mass • Spring Stiffness • Sled Support • Cannot exceed Actuator Force

  11. Physical Influences cont… • Number of Sleds • Capacity • Parallelism • Number of Active Tips • Parallelism • Power • Error Rates • Materials

  12. Performance Influences • Seek Time • Settle Time • Turnaround Time • Bandwidth • Capacity • Power Consumption • Reliability

  13. Performance Influences • Seek Time • Access velocity • Sled Accelleration • Actuator force • Number of Sleds • Sled Mass • Spring Stiffness • Settle Time • Actuator Force • Spring Stiffness • Sled Mass • Number of Sleds

  14. Performance Influences cont… • Turnaround Time • Actuator Force • Sled Mass • Number of Sleds • Sled Access Velocity • Spring Stiffness • Bandwidth • Bit Size • Sled Access Velocity • Actuator force, Sled Mass, Spring Stiffness, Number of Sleds • Error Rate

  15. Performance Influences cont… • Capacity • Increase • Actuator Force • Decrease • Bit Size • Error Rates • Sled Access Velocity • Number of Sleds • Power • Actuator Force • Number of Active Tips

  16. Performance Influences cont… • Reliability • Shock Tolerance • Increasing Actuator Force • Increasing Spring Force • Decreasing Sled Mass • Sled Failures • Number of Sleds • RAID

  17. Applications • Cache for Disks • Replace Disks • Portable Devices • Increased Shock Tolerance • Speed • Power Consumption • Size • Cost over Non-Volatile Memory

  18. Review Microelectromechanical Systems (MEMS) • Conventional VLSI/CMOS Processes • Disk-to-Memory Performance Gap • Disk Cache / Replacement • Portable Devices

  19. Sources • http://www.ece.cmu.edu/research/chips/ • Carley, L.R. “MEMS-Based Integrated-Circuit Mass-Storage Systems.” Communications of the ACM Vol.43, No. 11 (2000) 73-80. • Griffin, John L. “Modeling and Performance of MEMS-Based Storage Devices.” Carnegie Mellon U. 2000. • Schlosser, Steven W. “Designing Computer Systems with MEMS-based Storage.” Carnegie Mellon U. 2000.

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