Secondary Storage Chapter 8 Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights...
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Transcript of Secondary Storage Chapter 8 Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights...
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Secondary Storage
Chapter 8
Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights reserved.8-1
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• Distinguish between primary and secondary storage
• Compare internal and external hard disks• Describe ways to improve hard-disk operations,
including disk caching, redundant arrays of inexpensive disks, and data compress-ion and decompress-ion
Competencies (Page 1 of 2)
8-2 Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights reserved.
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Competencies (Page 2 of 2)
• Discuss solid-state storage devices including flash memory and USB drives
• Discuss the different types of optical disks• Describe Internet drives, floppy disks, and magnetic
tape• Discuss mass storage,
mass storage devices, and storage area networks
8-3 Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights reserved.
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Storage
• Primary storage– Volatile storage– Temporary
storage
• Secondary storage– Nonvolatile storage– Permanent storage
• Secondary storage characteristics – Media– Capacity– Storage devices– Access speed
8-4 Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights reserved.
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Secondary Storage Devices
• Provides permanent or nonvolatile storage
• Data and programs can be retained after the computer has been shut off
• Most desktop microcomputer systems have hard and optical disk drives
8-5 Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights reserved.
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• Use thicker, metallic platters for storage• Faster than a floppy diskette• Large capacity• Sensitive instruments • There are three types of hard disks:
– Internal Hard Disk– External Hard Disks– Digital Versatile Discs
• Performance Enhancements
Hard Disks
8-6 Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights reserved.
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Materials that Cause a Head Crash
• Head crash is a disaster for a hard disk
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• Located inside system unit
• Designated as the C drive
• Advantages over other removable
media
– Capacity
– Access speed
Internal Hard Disk
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• Removable hard disks
• Used to complement internal
hard disk
• Capacities of 20 to 500 GB
External Hard Disks
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PC Card Hard Disks
Hard-disk cartridge
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• Solid –state drives (SSDs)• Flash memory cards
– Widely used in notebook computers– Used to record MP3 music files
• USB Drives – Flash drives– Very compact– Capacity from 1 GB to 256 GB
Solid-State Storage
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Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights reserved.
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• Hold over 50 gigabytes of data• Attributes
– Lands
– Pits
• Three types– Compact Disc (CD)
– Digital Versatile Disc (DVD)
– Hi-Def Disc
Optical Disks
8-11 Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights reserved.
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• The Internet can be used as a medium to locate and play music and videos
• A user can create compact discs, or transfer music to a portable player
• Requirements– Software– Hardware– Internet
Making IT Work for YouIPods and Videos From The Internet
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• Optical format• From 650 MB to 1 GB capacity• Rotation speeds vary • Three basic types
– Read only: CD-ROM– Write once: CD-R– Rewriteable: CD-RW
Compact Disc
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• DVD stands for digital versatile disk or digital video disk
• DVD-ROM
• DVD+R and DVD-R
• DVD+RW, DVD-RW, and DVD-RAM
Digital Versatile Disks
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• Digital Versatile Disc or Digital Video Disc (DVD)• Similar to CDs, but can store more data• Three basic types
– Read only: DVD-ROM– Write once: DVD+R; DVD-R– Rewritable: DVD+RW; DVD-RW; DVD-RAM
Digital Versatile Disc
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• Next generation of optical disc• Far greater capacity than DVDs• Three basic types
– Read only– Write once– Rewriteable
• Two competing hi def formats– HD DVD– Blu-Ray
High-Definition Disc
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• Online storage services
• Floppy disks
• Magnetic tape
Other Types of Secondary Storage
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• External storage• Provides sequential access
– Information stored in sequence – Slower than disks which provide
direct access
• Magnetic tape streamers or tape cartridges used by both mainframes and microcomputers
Magnetic Tape
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• Mass storage refers to the tremendous amount of secondary storage required by large organizations
• Mass storage devices are specialized high-capacity secondary storage devices
• Enterprise storage system
promotes efficient and safe use of data across networks within organizations
Mass Storage Devices
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• File servers
• Network attached storage (NAS)
• RAID systems
• Tape library
• Organizational online storage
Enterprise Storage Systems
8-20 Copyright © 2011 by The McGraw-Hill Companies, Inc. All rights reserved.