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STORAGE

A storage mediumis the physicalmaterial on which a

computer keepsdata, instructions,and information

Storage holds data,instructions, andinformation for

future use

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Capacity is the number of bytes a storage mediumcan hold

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A storage device is the computer hardware thatrecords and/or retrieves items to and from storagemedia

Reading is the process oftransferring items from astorage medium into memoryREADING

Writing is the process oftransferring items frommemory to a storage mediumWRITING

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Access time measures: The amount of time ittakes a storage device to

locate an item on a storagemedium The time required todeliver an item from memoryto the processor

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A hard disk contains one or more inflexible,circular platters that use magnetic particles tostore data, instructions, and information

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Hard disks canstore data using

longitudinalrecording orperpendicular

recording

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Capacity

Cylinders

Read/WriteHeads

AccessTime

TransferRate

Revolutionsper Minute

Sectors andTracks

Platters

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Formatting is the process of dividing

the disk into tracks and sectors so thatthe operating system can store and

locate data and information on the disk

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The hard disk armsmove the read/writehead, which reads itemsand writes items in the

drive Location often isreferred to by itscylinder

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A head crash occurs when a read/write head

touches the surface of a platterAlways keep a backup of your hard disk

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RAID (redundant array of independent disks) is a

group of two or more integrated hard disksA network attached storage (NAS) device is aserver connected to a network with the solepurpose of providing storage

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An external hard disk is a separate free-standinghard disk that connects to your computer with acable or wirelessly

A removable hard disk is a hard disk that youinsert and remove from a drive

Internal and external hard disks are available in

miniature sizes (miniature hard disks)

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A disk controller consists of a special-purpose chipand electronic circuits that control the transfer ofdata, instructions, and information from a disk to

and from the system bus and other components ofthe computer

SATA

SAS

EIDE SCSI

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Flash memory chips are a type of solid statemedia and contain no moving parts

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A memory card is aremovable flashmemory device thatyou insert and remove

from a slot in acomputer, mobiledevice, or cardreader/writer

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USB flash

drives pluginto a USB port

on a computeror mobiledevice

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An ExpressCardmodule is aremovable device thatfits in an ExpressCardslotDeveloped by thePCMCIACommonly used innotebook computers

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Cloud storage isan Internetservice that

provides storageto computer users

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Access files from any computer

Store large files instantaneously

Allow others to access their files

View time-critical data and images immediately

Store offsite backups

Provide data center functions

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A CD-ROM can be read from but notwritten to

Read from a CD-ROM drive or CD-ROM player

A CD-R is a multisession optical disc onwhich users can write, but not erase

A CD-RW is an erasable multisession disc

Must have a CD-RW drive

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A DVD-ROM is a high-capacity optical discon which users can read but not write or erase

Requires a DVD-ROM drive

A Blu-ray Disc-ROM (BD-ROM) has astorage capacity of 100 GB

DVD-RW, DVD+RW, and DVD+RAM arehigh-capacity rewritable DVD formats

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