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C Session 16 Revised Secondary Storage Computing Essentials

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C Session 16 Revised Secondary Storage Computing Essentials 7/28/2009 8-2 Competencies Distinguish between primary & secondary storage SECONDARY Discuss the different types of storage media STORAGE Descr ibe t he tra dit iona l fl oppy di sk and th e hi gh capacity floppy disks Describe various types of hard disk devices © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-3 8-4 Competencies cont. Storage Describe ways to improve hard-disk operations Primary storage Secondary storage Describe the different types of optical disks Volatile Nonvolatile Temporary Permanent Describe other kinds of secondary storage Secondaryyg storage didevices characteristics Media Capacity Storage devices Access speed © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-5 8-6 Secondary Storage Devices Traditional Floppy Disks Traditional Floppies DiDiskettesskettes Portable storage media Traditional Floppy Floppy disk drives Diskette (FDD) © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 1 7/28/2009 8-7 8-8 Types of Floppies Hard Disks High capacity Use thicker, metallic platters for storage Known as a floppy-disk cartridge Internal (fixed) or external Require special disk drives Faster access speed than a floppy diskette Three well known types Direct or random access to data Zip disks Large capacity HiFD disks Sensitive instruments SuperDisks © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-9 8-10 Hard-Disk Cartridges Hard-Disk Packs Removable Removable hard disks Massive storage capacity Used to complement Common in mainframes internal hard disk Resembles stack of vinyl records Capacities of 10 to 20 GB PC Card Hard Disks © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-11 8-12 Performance Enhancements Optical Disks Disk caching Compact Permanent storage Redundant arrays of inexpp()ensive disks (RAID) Laser beams reflect off pits Two common types File compression CD and decompression DVD Defragmentation © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 2 7/28/2009 8-13 8-14 Compact Disc Digital Versatile Disc Optical format Digital Versatile Disk or Digital Video Disk From 650 MB to 1 GB capacity (DVD) Rotation speeds vary Similar to CDs, but can store more data Types Types Read only: CD-ROM Read only: DVD-ROM Write once: CD-R Write once: DVD-R Rewriteable: CD-RW Rewritable: DVD-RW Picture CDs and Photo CDs © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-15 8-16 DataPlay Other Types of Secondary Storage Optical disk Solid-state storage Write once format Quarter size Internet hard drives 500 MB capacity Holds 5 hours of CD-quality Magnetic tape sound Use for storing and playing music files © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-17 8-18 Magnetic Tape Solid-State Storage External storage Flash memory cards Provides sequential access Widely used in notebook computers Information stored in sequence Used to record MP3 music files Slower th an di sk s whi c h prov ide direct access Key chain hard drives Magnetic tape streamers or tape Key chain flash memory cartridges used by both devices mainframes and Connects to a USB port microcomputers © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 3 7/28/2009 8-19 8-20 Internet Hard Drives A Look to the Future Blu-Ray Technology New standard in storage Blu-Ray New disks use blue laser light instead of the red laser light used in traditional CD players Disks may ultimately hold Over 30GB on one-sided disks Over 50GB on two-sided disks © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-21 8-22 FAQs Discussion Questions What is the difference between primary storage Discuss three ways to improve the performance and secondary storage? of hard disks. What kind of data access do floppy and hard Describe the different types of compact discs. drives use ? Descr ibe t he different types of DVD s. What is the C drive of a computer? What are the advantages and disadvantages of When would I use a hard-disk cartridge? using an Internet hard drive? What is the difference between a CD and a Describe solid state technology. Discuss the DVD? many uses for key chain flash memory devices. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-23 Participation Question Optical disks that can be written on only once are called: A. CD-ROM B. CD-R C. CD-RW D. CD-DVD E. CD-W © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 4.
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