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Storage by Mind Map: Storage
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Objectives Overview

Differentiate between storage devices and storage media

Describe the characteristics of an internal hard disk including capacity, platters, read/write heads, cylinders, sectors and tracks, revolutions per minute, transfer rate, and access time

Discuss the purpose of network attached storage devices, external and removable hard disks, and hard disk controllers

Describe the various types of flash memory storage

Describe cloud storage and explain its advantages

Describe the characteristics of optical discs

Differentiate among various types of optical discs: CDs, archive discs and Picture CDs, DVDs, and Blu‐ray Discs

Identify the uses of tape, magnetic stripe cards, smart cards, microfilm and microfiche, and enterprise storage


Storage holds data, instructions, and information for future use

A storage mediumis the physical material on which a computer keeps data, instructions, and information

Capacityis the number of bytes a storage medium can hold

A storage deviceis the computer hardware that records and/or retrieves items to and from storage media

Access timemeasures: –The amount of time it takes a storage device to locate an item on a storage medium –The time required to deliver an item from memory to the processor

New node

Hard Disks

A hard diskcontains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information

Hard disks can store data using longitudinal recording or perpendicular recording

Characteristics of a hard disk include:

Formattingis the process of dividing the disk into tracks and sectors so that the operating system can store and locate data and information on the disk

The hard disk arms move the read/write head, which reads items and writes items in the drive –Location often is referred to by its cylinder

A head crash occurs when a read/write head touches the surface of a platter

Always keep a backupof your hard disk

RAID(redundant array of independent disks) is a group of two or more integrated hard disks

A network attached storage(NAS) device is a server connected to a network with the sole purpose of providing storage

An external hard disk is a separate free‐standing hard disk that connects to your computer with a cable or wirelessly

A removable hard diskis a hard disk that you insert and remove from a drive

Internal and external hard disks are available in miniature sizes (miniature hard disks)

A disk controller consists of a special‐purpose chip and electronic circuits that control the transfer of data, instructions, and information from a disk to and from the system bus and other components of the computer

Flash Memory Storage

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

Solid state drives (SSDs) have several advantages over magnetic hard disks:

A memory cardis a removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader/writer

USB flash drivesplug into a USB port on a computer or mobile device

An ExpressCardmoduleis a removable device that fits in an ExpressCardslot

Developed by the PCMCIA

Commonly used in notebook computers

Cloud Storage

Cloud storage is an Internet service that provides storage to computer users

Users subscribe to cloud storage for a variety of reasons:

Optical Discs

An optical disc consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser

Typically store software, data, digital photos, movies, and music

Read only vs. rewritable

Optical discs commonly store items in a single track that spirals from the center of the disc to the edge

Track is divided into evenly sized sectors

Care of optical discs

A CD‐ROMcan be read from but not written to•Read from a CD‐ROM driveor CD‐ROM player

A CD‐Ris a multisession optical disc on which users can write, but not erase

A CD‐RWis an erasable multisession disc•Must have a CD‐RW drive

Archive disc

Other Types of Storage

Tapeis a magnetically coated ribbon of plastic capable of storing large amounts of data and information

A tape drivereads and writes data and information on a tape

A magnetic stripe cardcontains a magnetic stripe that stores information

A smart cardstores data on a thin microprocessor embedded in the card

Microfilmand microfichestore microscopic images of documents on a roll or sheet flim

Enterprise storage stores huge volumes of data and information for large businesses

Putting It All Together

Home user

Small Office/Home Office user


Power User

Enterprise User (desktop computer)

Enterprise User(server or mainframe)


Various storage media and storage devices