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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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