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Chapter 8

Chapter 8. Secondary Storage. Competencies (Page 1 of 2). Distinguish between primary & secondary storage Describe the traditional floppy disk and compare it to high capacity floppy disks Compare internal hard disks, hard-disk cartridges, and hard-disk packs. Page 210.

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Chapter 8

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  1. Chapter 8 Secondary Storage

  2. Competencies(Page 1 of 2) • Distinguish between primary & secondary storage • Describe the traditional floppy disk and compare it to high capacity floppy disks • Compare internal hard disks, hard-disk cartridges, and hard-disk packs Page 210

  3. Competencies (Page 2 of 2) • Describe ways to improve hard-disk operations, including disk caching, redundant arrays of inexpensive disks, and data compression and decompression • Discuss the different types of optical disks; mass storage • Describe solid-state storage, Internet drives, and magnetic tape Page 210

  4. Primary storage Volatile Temporary Secondary storage Nonvolatile Permanent Secondary storage characteristics Media Capacity Storage devices Access speed Storage RAM Page 212

  5. Secondary Storage Devices • Most desktop microcomputer systems have floppy disks, hard disks, and optical disk drives Page 212

  6. Traditional Floppy Disk • Also known as: • Diskettes • Floppies • Portable storage media • Floppy disk drives (FDD) Insert Art Work top of page 213 Page 212

  7. High Capacity Floppy Disks Known as a floppy-disk cartridge • Require special disk drives • Three well known types • Zip disks • HiFD disks • SuperDisks Page 214

  8. Hard Disks • 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 cartridge • Hard-disk pack Page 215

  9. Materials that Cause a Head Crash • Head crash is a disaster for a hard disk Return Page 215

  10. Internal Hard Disk • Located inside system unit • Known as a fixed disk • Designated as the C drive • Advantages over floppies • Access speed • Capacity Page 215

  11. Optical Disks • Compact • Permanent storage • Laser beams reflect off pits • Two common types • CD • DVD Page 219

  12. 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 Page 219

  13. Digital Versatile Disc • Digital Versatile Disk or Digital Video Disk(DVD) • Similar to CDs, but can store more data • Types • Read only: DVD-ROM • Write once: DVD+R; DVD-R • Rewritable: DVD+RW; DVD-RW; DVD-RAM Page 220

  14. Other Types of Secondary Storage • Solid-state storage • Internet hard drives • Magnetic tape Page 221

  15. 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 Return Page 221

  16. Internet Hard Drives • Known as i-drive or online storage Return Page 224

  17. 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 Return Page 225

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