88 CHAPTER SECONDARY STORAGE

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-2 Competencies Distinguish between primary & secondary storage Discuss the different types of storage media Describe the traditional floppy disk and the high capacity floppy disks Describe various types of hard disk devices

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-3 Competencies cont. Describe ways to improve hard-disk operations Describe the different types of optical disks Describe other kinds of secondary storage devices

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-4 Storage Primary storage Volatile Temporary Secondary storage Nonvolatile Permanent Secondary storage characteristics Media Capacity Storage devices Access speed

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-5 Secondary Storage Devices

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-6 Floppy Disks Diskettes Floppies Portable storage media Floppy disk drives (FDD) Traditional Floppy Disk

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-7 Traditional Floppy Diskette

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-8 Types of Floppies High capacity Known as a floppy-disk cartridge Require special disk drives Three well known types Zip disks HiFD disks SuperDisks

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 8-9 Hard Disks Use thicker, metallic platters for storage Faster than a floppy diskette Large capacity Sensitive instruments

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Materials that Cause a Head Crash

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Internal Hard Disk Located inside system unit Known as a fixed disk Designated as the C drive Advantages over floppies Access speed Capacity

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Hard-Disk Cartridges Removable hard disks Used to complement internal hard disk Capacities of 10 to 20 GB PC Card Hard Disks

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Hard-Disk Packs Removable Massive storage capacity Common in mainframes Resembles stack of vinyl records

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Hard-Disk Pack

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Performance Enhancements Disk caching Redundant arrays of inexpensive disks (RAID) File compression and decompression

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Optical Disks Compact Permanent storage Laser beams reflect off pits Two common types CD DVD

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Compact Disc Optical format From 650 MB to 1 GB capacity Rotation speeds vary Types Read only: CD-ROM Write once: CD-R Rewriteable: CD-RW Picture CDs and Photo CDs

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Digital Versatile Disc Digital Versatile Disk or Digital Video Disk (DVD) Similar to CDs, but can store more data Types Read only Write once Rewritable

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved DataPlay Optical disk Write once format Quarter size 500 MB capacity Holds 5 hours of CD-quality sound Use for storing and playing music files

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Other Types of Secondary Storage Solid-state storage Internet hard drives Magnetic tape

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Solid-State Storage Flash memory cards Widely used in notebook computers Used to record MP3 music files Key chain hard drives Key chain flash memory devices Connects to a USB port

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Internet Hard Drives

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Magnetic Tape 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

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved 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 Key Terms 1.44 MB 31/2-inch disk (211) 2HD (211) access time (210) C drive (213) capacity (210) CD (compact disc) (216) CD burner (216) CD-R (CD-recordable) (216) CD-ROM (compact disc- read only memory) (216) CD-RW (compact disc rewritable) (217) DataPlay (220) density (211) direct access (221) disk caching (213) Diskette (210)

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Key Terms disk (210) DVD (digital versatile disc or digital video disc) (217) DVD-RW or DVD+RW (DVD rewritable) (217) DVD-R or DVD+R (DVD recordable) (217) DVD-RAM (DVD- random-access memory) (217) DVD player (217) DVD-ROM (digital versatile disc-read only memory) (217) Erasable optical disk (217) file compression (215)

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Key Terms file decompression (215) fixed disk (212) flash memory card (221) flexible disk (211) floppies (211) floppy disk (210) floppy disk drive (FDD) (210) Floppy-disk cartridge (211) hard disk (212) hard-disk cartridge (213) hard-disk pack (214) head crash (212) HiFD disk (212) high capacity floppy disk (211)

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Key Terms i-drive (221) internal hard disk (212) Internet hard drive (221) jewel box (216) key chain hard drives (221) label (211) land (216) magnetic tape (222) magnetic tape reel (222) magnetic tape streamer (222) media (210) medium (210) multiread (217) multisession (217) nonvolatile storage (210) online storage (221)

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Key Terms optical disk (216) optical disk drive (216) PC Card hard disk (214) Photo CD (217) Picture CD (217) pit (216) platters (212) primary storage (210) reading (210) redundant arrays of inexpensive disks (RAID) (215) removable hard disk (213) rotational speed (216) secondary storage (210) secondary storage device (210) sector (211)

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Key Terms sequential access (221) shutter (211) single-session (217) solid-state storage (220) storage devices (210) SuperDisk (212) tape cartridge (222) track (211) volatile storage (210) write-protection notch (211) writing (210) Zip disk (211)

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved FAQs What is the difference between primary storage and secondary storage? What kinds of floppy disks are available? What is the C drive of a computer? When would I use a hard-disk cartridge? What is the difference between a CD and a DVD?

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Discussion Questions Discuss three ways to improve the performance of hard disks. Describe the different types of compact discs. Describe the different types of DVDs. What are the advantages and disadvantages of using an Internet hard drive? Describe solid state technology. Discuss the many uses for key chain flash memory devices.