DiskModelling - Paper by: Chris Ruemmler and John Wikes...

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Paper by: Chris Ruemmler and John Wikes Presentation by: Timothy Goldberg, Daniel Sink, Erin Collins, and Tony Luaders
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Introduction Disk Drive performance improvements at 7- 10% Compared to microprocessors at 40-60% or disk storage capacities at 60-80% (annually) Simulation models to compare alternative approaches High quality disk drive model Error factor 14 times smaller
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Outline Introduction Characteristics of Modern Disk Drives Recording Components Positioning Components Disk Controller Modeling Disk Drives
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Characteristics of Modern Disk Non-removable magnetic disk drives Contain a mechanism and controller Recording Components: rotation disks and heads Positioning Components: moves heads into correct position with track-following system Emphasis on features that could be important when creating a disk drive model
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Recording Components Smaller disks: Less surface area for data Less power consumption Can spin faster Smaller seek distances Increased storage density: Better linear recording density, maximum rate of flux changes Packing separate tracks of data more closely together May contain from 1 to 12 platters Stack rotates in lockstep
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Recording Components Spindle rotation speed: Higher spin speed increases transfer rates, shortens rotation latencies Higher power consumption, requires better bearings Each platter surface has a disk head Responsible for recording (writing) And sensing (reading) magnetic flux variation Single Read-Write data channel Can be switched between the heads Responsible for encoding and decoding data stream into or from a series of magnetic phase changes stored on the disk
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Disk Drive
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DiskModelling - Paper by: Chris Ruemmler and John Wikes...

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