presentation about basic os memory drives
TRANSCRIPT
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88CHA
PTE
R
SECONDARY
STORAGE
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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