Discovering Computers 2010

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Living in a Digital World

Discovering

Computers 2010

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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

Discovering Computers 2010: Living in a Digital World Chapter 7

See Page 351 2

for Detailed Objectives

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Objectives Overview

Describe cloud storage and explain its advantages Describe

Differentiate Identify

See Page 351 3

for Detailed Objectives

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Storage

Pages 352 - 353 4

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Storage

Pages 352 – 353 5 Figure 7-1

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Storage

• Capacity is the number of bytes a storage medium can hold

Page 354 6 Figure 7-2

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Storage

• A storage device is the computer hardware that records and/or retrieves items to and from

storage media

Page 354 7

Reading

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Storage

• 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

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Hard Disks

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

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Hard Disks

• Hard disks can store data using longitudinal

recording or perpendicular recording

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Hard Disks

• Characteristics of a hard disk include:

Capacity Platters

Read/Write Heads Cylinders

Sectors and Tracks

Revolutions per Minute Transfer Rate

Access Time

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Hard Disks

• Formatting is 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

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Hard Disks

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Hard Disks

• 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

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Hard Disks

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

• Always keep a backup of your hard disk

Pages 358 – 359 15 Figure 7-11

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Hard Disks

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Hard Disks

• 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

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Hard Disks

An

Pages 360 – 361 18 Figures 7-14 – 7-15

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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

Pages 361 - 362 19

SATA EIDE SCSI SAS

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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:

Pages 362 - 363 20

Faster access time Faster transfer rates

Generate less heat and consume less power

Last longer

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Flash Memory Storage

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Flash Memory Storage

• A memory card is a removable flash memory

device that you insert and remove from a slot in a computer, mobile device, or card reader/writer

Page 364 22

CompactFlash Secure Digital (SD)

Secure Digital High Capacity (SDHC) microSD

microSDHC xD

Memory Stick

Memory Stick Micro (M2)

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Flash Memory Storage

Pages 364 – 365 23 Figures 7-18 – 7-19

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Flash Memory Storage

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Flash Memory Storage

• USB flash drives plug into a USB port on a computer or mobile device

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Video: Thumb Drive (USB Flash Drive) Encryption

26

CLICK TO START

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Flash Memory Storage

• An ExpressCard module is a removable device that fits in an

ExpressCard slot

• Developed by the PCMCIA

• Commonly used in notebook computers

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Cloud Storage

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

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Cloud Storage

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Cloud Storage

• Users subscribe to cloud storage for a variety of reasons:

Page 369 30

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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

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Optical Discs

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Optical Discs

• 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

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Optical Discs

• Care of optical discs

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Optical Discs

Read from a A

Pages 372 – 373 35 Figure 7-29

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Optical Discs

Archive disc

Page 374 36

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Optical Discs

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Optical Discs

A

Requires a

Pages 375 – 376 38 Figure 7-29

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Other Types of Storage

Tape

Magnetic stripe cards and smart cards Microfilm and microfiche

Enterprise storage

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Other Types of Storage

• Tape is 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

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Other Types of Storage

• A magnetic stripe card contains a magnetic stripe that stores information

• A smart card stores data on a thin

microprocessor

embedded in the card

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Other Types of Storage

• Microfilm and microfiche store microscopic images of documents on a roll or sheet flim

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Other Types of Storage

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Other Types of Storage

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

– Uses special hardware for heavy use, maximum availability, and maximum efficiency

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Putting It All Together

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Putting It All Together

Power User

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