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Storage by Mind Map: Storage
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Hard Disks

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

can store data using longitudinal recording or perpendicular recording

Characteristics of a hard disk



Read/Write Heads


Sectors and Tracks

Revolutions per Minute

Transfer Rate

Access Time


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 backup of your hard disk


a group of two or more integrated hard disks

network attached storage

device is a server connected to a network with the sole purpose of providing storage

external hard disk

a separate free-standing hard disk that connects to your computer with a cable or wirelessly

removable hard disk

a hard disk that you insert and remove from a drive

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

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


can be read from but not written to

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


a multisession optical disc on which users can write, but not erase


an erasable multisession disc

Must have a CD-RW drive

Archive disc

Stores photos from an online photo center

Resolution usually is 7200 pixels per photo

Cost is determined by the number of photos being stored

Picture CD

Single-session CD-ROM that stores digital versions of film

Typically uses a 1024 x 1536 resolution

Many photo centers offer Picture CD services


a high-capacity optical disc on which users can read but not write or erase

Requires a DVD-ROM drive

Blu-ray Disc-ROM (BD-ROM)

a storage capacity of 100 GB


high-capacity rewritable DVD formats

Objectives Overview

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

Differentiate between storage devices and storage media

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


A storage medium

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

holds data, instructions, and information for future use


the number of bytes a storage medium can hold

storage device

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

Access time

measures, 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

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, Faster access time, Faster transfer rates, Generate less heat and consume less power, Last longer

memory card

a removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader/writer, CompactFlash (CF), Secure Digital (SD), Secure Digital High Capacity (SDHC), microSD, microSDHC, xD Picture Card, Memory Stick, Memory Stick Micro (M2)

USB flash drives

plug into a USB port on a computer or mobile device

ExpressCard module

a removable device that fits in an ExpressCard slot

Developed by the PCMCIA

Commonly used in notebook computers

Cloud Storage

an Internet service that provides storage to computer users

Users subscribe to cloud storage for a variety of reasons

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

Other Types of Storage


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

A tape drive reads and writes data and information on a tape

magnetic stripe card

contains a magnetic stripe that stores information

smart card

stores data on a thin microprocessor embedded in the card

Microfilm and microfiche

store microscopic images of documents on a roll or sheet flim


Various storage media and storage devices

Internal hard disks, external and removable hard disks, solid state drives, memory cards, USB flash drives, ExpressCard modules, cloud storage, CDs, DVDs, and Blue-ray Discs, tape, smart cards, and microfilm and microfiche