presentation about basic os memory drives

7/24/2019 Presentation about basic os Memory Drives

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88CHA

PTE

R

SECONDARY

STORAGE


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2005 The McGraw-Hill Companies, Inc. All Rights

Competencies

Distinguish between primary & secondary

storage

Discuss the different types of storage mediaDescribe the traditional floppy disk and the high

capacity floppy disks

Describe various types of hard disk devices


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Competencies cont.

Describe ways to improve hard-disk operations

Describe the different types of optical disks

Describe other kinds of secondary storagedevices


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Storage

Primary storage

olatile

!emporary

"econdary storage

#onvolatile

Permanent

"econdary storagecharacteristics

$edia

%apacity

"torage devices

ccess speed


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Secondary Storage Devices


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Floppy Disks

Diskettes

)loppiesPortable storage

media

)loppy disk drives*)DD+

Traditional FloppyDisk


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Traditional Floppy Diskette


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Types of Floppies

igh capacity

.nown as a floppy-disk cartridge

/e0uire special disk drives!hree well known types

1ip disks

i)D disks"uperDisks


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Hard Disks

se thicker metallic platters for storage

)aster than a floppy diskette

5arge capacity

"ensitive instruments


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Materials that Cause a Head Crash

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Internal Hard Disk

5ocated inside system unit

.nown as a fied disk

Designated as the C drive

dvantages over floppies

ccess speed

%apacity

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Hard-Disk Cartridges

/emovable hard disks

sed to complement

internal hard disk

%apacities of 67 to 27

9: C Card Hard Disks

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Hard-Disk acks

/emovable

$assive storage capacity

%ommon in mainframes/esembles stack of vinyl records

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Hard-Disk ack

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erformance !nhancements

Disk caching

/edundant arrays of

inepensive disks */;D+

)ile compression

and decompression

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"ptical Disks

%ompact

Permanent storage

5aser beams reflect off pits!wo common types

%D

DD

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Compact Disc


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Digital #ersatile Disc

Digital ersatile Disk or Digital ideo Disk

*DD+

"imilar to %Ds but can store more data

!ypes

/ead only

>rite once/ewritable

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Datalay

rite once format

?uarter si@e'77 $: capacity

olds ' hours of %D-0uality

sound

se for storing and playing

music files

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"ther Types of Secondary Storage

"olid-state storage

;nternet hard drives

$agnetic tape

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Solid-State Storage

)lash memory cards

>idely used in notebook computers

sed to record $P3 music files

.ey chain hard drives

.ey chain flash memory

devices

%onnects to a ": port

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Internet Hard Drives

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Magnetic Tape

Aternal storage

Provides se$uential access

;nformation stored in se0uence

"lower than disks which provide

direct access

$agnetic tape streamers or tape

cartridges used by both

mainframes and

microcomputers

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% &ook to the Future

'lu-(ay Technology

#ew standard in storage

:lu-/ay

#ew disks use blue laser light instead of the red laser

light used in traditional %D players

Disks may ultimately hold


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)ey Terms

6B44 $: 36C2-inch disk*266+

2D *266+

access time *267+% drive *263+

capacity *267+

%D *compact disc+ *26(+

%D burner *26(+

%D-/ *%D-recordable+*26(+

%D-/ *compact disc

rewritable+ *26,+DataPlay *227+

density *266+

direct access *226+disk caching *263+

Diskette *267+

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)ey Terms

disk *267+

DD *digital versatile

disc or digital video disc+

*26,+DD-/> or DD/>

*DD rewritable+ *26,+

DD-/ or DD/*DD recordable+ *26,+

DD-/$ *DD-

random-access memory+

*26,+

DD player *26,+DD-/


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)ey Terms

file decompression *26'+

fied disk *262+

flash memory card *226+

fleible disk *266+

floppies *266+

floppy disk *267+

floppy disk drive *)DD+

*267+

)loppy-disk cartridge

*266+

hard disk *262+

hard-disk cartridge *263+

hard-disk pack *264+

head crash *262+

i)D disk *262+

high capacity floppy disk

*266+

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)ey Terms

i-drive *226+

internal hard disk *262+

;nternet hard drive *226+

Eewel bo *26(+

key chain hard drives

*226+

label *266+

land *26(+

magnetic tape *222+

magnetic tape reel *222+

magnetic tape streamer

*222+

media *267+

medium *267+

multiread *26,+

multisession *26,+

nonvolatile storage *267+

online storage *226+

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)ey Terms

optical disk *26(+

optical disk drive *26(+

P% %ard hard disk *264+

Photo %D *26,+

Picture %D *26,+

pit *26(+

platters *262+

primary storage *267+

reading *267+

redundant arrays of

inepensive disks */;D+

*26'+

removable hard disk*263+

rotational speed *26(+

secondary storage *267+

secondary storage device

*267+

sector *266+

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)ey Terms

se0uential access *226+

shutter *266+

single-session *26,+

solid-state storage *227+

storage devices *267+

"uperDisk *262+

tape cartridge *222+

track *266+

volatile storage *267+

write-protection notch

*266+

writing *267+

1ip disk *266+

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F%*s

>hat is the difference between primary storage

and secondary storageF

>hat kinds of floppy disks are availableF

>hat is the % drive of a computerF

>hen would ; use a hard-disk cartridgeF

>hat is the difference between a %D and aDDF

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Discussion *uestions

Discuss three ways to improve the performance

of hard disksB

Describe the different types of compact discsB

Describe the different types of DDsB

>hat are the advantages and disadvantages of

using an ;nternet hard driveFDescribe solid state technologyB Discuss the

many uses for key chain flash memory devicesB

presentation about basic os memory drives

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