Mems mass storage syatem
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Transcript of Mems mass storage syatem
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MEMS BASED INTEGRATED CIRCUIT
MASS STORAGE SYSTEMS
Presented by
prashant singh(imi2011003)
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Highlights New secondary storage technology that could revolutionize computer
architecture.
-Faster than hard drives
-Lower entry cost
-Lower weight and volume
-Lower power consumption
Discuss physical description of device.
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Disk Drive limitations Disk-drive capacities double every 18 months
-better 60% per year growth rate of semiconductor memories
Two major limitations of disk drives are…..
-Access times decreases have been minimal
-Minimum entry cost remains too high for many applications
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Problem Specification
Requirement of mass storage system that can break both barrier
-Access times
-Minimum entry cost
New mass storage should also be significantly cheaper than non-volatile RAM
-$100 now buys 1 GB of flash memory
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MEMS MEMS use
-Same parallel wafer-fabrication process as semiconductor memories
-Keeps the prices low
-Same mechanical positioning of R/W heads as disk drives
-Data can be stored using higher density thin film technology
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Main Advantages Of MEMS
Potential for dramatic decrease in-Entry cost(10x cheaper than RAM)
-Access time
-Volume
-Mass
-Power dissipation
-Failure rate
-Shock sensitivity
Integrate storage with computation
-Complete system-on-chip integration
-Processing unit
-RAM
-Non-volatile storage
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MEMS storage prototype
Like a disk drive, it has
-recording heads
-a moving magnetic recording medium
Major departures from disk drive architecture are
-MEMS recording heads-probe tips-are fabricated in a parallel wafer level manufacturing process
-Media surface does not rotate(Data latency decreases)
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Data Organization
disk
MEMS
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Media Surface Movement
Media surface that rotate requires ball bearings
Very small ball bearing may have “striction” problem that prevent accurate positioning
-Element would move by sticking and slipping
Best solution is to have media sled moving in X-Y directions
-Sled moves in Y-direction for data access
-Sled is suspended by spring
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Read/writetips
Read/writetips
Conceptual View of “Moving Media”(CMU prototype)
Read/Writetips
Read/Writetips
MagneticMedia
MagneticMedia
ActuatorsActuators
Bits storedunderneath
each tip
Bits storedunderneath
each tipMediaMedia
side view
SpringsSprings
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Operation (A) (B) (C)
(D) (E) (F)
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The Media Sled
Actuator pull sled in both dimensions
Size 8mm X 8mm X 500µm
Held over the probe tip array by a network of springs
Motion applied through electrostatic actuators
-Motion limited to 10% or less of suspension/actuator length
-Each probe tip can sweep 1% of the media sled
Include large number of probe tips for
-Improving data throughput
-Increasing system reliabilityRead write operation
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Probe Tip Positioning Most MEMS include some form of tip height control because
-Media surface is not perfectly flat
-Probe tip height may vary
CMU(Carnegie Mellon University,Pennsylvania,US) prototype places each probe tip on a separate cantilever
-Cantilever is electrostatically actuated to a fixed distance from the media surface
IBM Millipede
-Uses 32 x 32 array of probe tips
-Each tip is placed at the end of a flexible cantilever
-Cantilever bends when tip touches surface
HP design places media surface and probe tips sufficiently apart
-No need to control probe tips heightIBM Millipede
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Probe Tip Fabrication Major challenge is fabricating read/write probe tips in a way that is
compatible with the underlying CMOS circuitry
This includes
-thermal compatibility
-geometrical compatibility
-chemical compatibility……..
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Failure Management MEMS devices will have internal failures
-Tips will break during fabrication/assembly, use
-Media can wear(erosion/sideways displacement)
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Storing, Reading and Writing Bits CMU prototype uses same magnetic recording technology as current
disk drives
-Minimum mark size around 80µm x 80µm
Other solutions include
-Melting pits in a polymer (IBM Millipede)
-Raises tip wear issues
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Potential Application Lighter and less shock sensitive than disk drives
-Great for notebook PC’s,PDA’s and video camcorders
Lower cost than disk drives in 1 to 10 GB range
-Will open many new applications
High areal densities
-Great for storing huge amounts of data
Can combine computing and storage on a single chip
E.g. Average service time around 0.52 ms
-Disk drive service time is 10.1 ms
-Key factor for service time is X-seek time
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Thank You