potential application of solid state drives in netbooks (technical presentation)
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State Drives in NetBooks
Jason Jeonghwan KimDepartment of Electrical and Computer Engineering
University of Waterloo2 A Candidate for B.A.Sc. in Electrical Engineering
Feb 26, 2009
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ac groun on so s a e r ves
Overview of
Netbooks
Advantages of using solid state drives Weight Superior Kinetic Shock Resistance
Disadvantages of using solid state drives
Price Amount of Data Storage
Summary
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Solid State ?
Non volatile
Fast rea access time Not to be confused with other kinds of solid
state drives
. . , ,
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Representation of 0/1
By type of charge stored in the float gate
Charge > Current
*Diagram from www.wikipedia.org4
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Reading data
+ Voltage on bit lineGround source line
Negatively charged float
gate No flow of current
gate Flow of current
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Writing data
Ground source line+ Voltage on bit line+ Voltage on Control
Electrons move into float
tunneling effect To remove electrons
negative voltage
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Ultra portable laptop
computers Priced under $500 CPU Stora e RAM
Inferior to other laptops
0.90 kg ~ 1.50 kg
*Diagram from www.wikipedia.org7
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Inadequacy of Using HDD* for NetBooks
ow access t me
Access time for HDD= sp n up t me
+ seek time
+ transfer time
much vibration
Heat
*This analysis of HDD is applicable only for 2.5 HDD.*Diagram from www.wikipedia.org
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SSD has no moving
parts. Weight Short Access Time Superior Kinetic Shock
*Photograph from opussolution.net9
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WeightHDD vs SSDWeight (grams)
160
180
.
120 40% less
82.5666666780 HDDSSD
20
40
0
1 2 3 4 5 6 Average
*Data found from www.amazon.com10
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Access time for HDD
= spin up time
Access time for SSD
= spin up time + seek time
+ rotational delay + seek time
+ rotational delay
+ transfer time + transfer time
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Average Read Transfer PerformanceHDD vs SSDMb/s
114.44120
140
80
10090% faster
.
40
60 HDDSSD
0
20
Mostrecentmodels
*Data found from www.tomshardware.com12
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Average Write Transfer PerformanceHDD vs SSDMb/s
120
140
95.57
80
100
40% faster.
40
60 HDDSSD
0
20
Mostrecentmodels
*Data found from www.tomshardware.com13
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Head is close to rotating
platter 70 nm to 200 nm
Platter is rotating at a
high speed A thin film of hi h air
pressure builds up
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When the hard drive is shaken,
Tem oral imbalance in air ressure Lift < weight
Consequences of head crash Parts of platter become unusable Dama ed head Dust particle created within the hard drive
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Contains no moving parts
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Price
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$700.00
800.00
$500.00
$600.00
$300.00$400.00 HDD
SSD
$100.00
$200.00
$0.00
250 Gb 160 Gb 120 Gb / 128 Gb 40 Gb / 32 GB
*Data from www.pricewatch.com and www.pricewatch.com18
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Background on HDD, SSD and Netbook
Short Access Time
Weig t Superior Kinetic Shock Resistance
Disadvantages of using solid state drives
Amount of Data Storage
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