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8. CHAPTER. SECONDARY STORAGE. Primary storage Volatile Temporary. Secondary storage Nonvolatile Permanent Secondary storage characteristics Media Capacity Storage devices Access speed. Storage. RAM. Secondary Storage Devices. Traditional Floppy Disk. Floppy Disks. Diskettes

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  1. 8 CHAPTER SECONDARY STORAGE

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

  3. Secondary Storage Devices

  4. Traditional Floppy Disk Floppy Disks • Diskettes • Floppies • Portable storage media • Floppy disk drives (FDD)

  5. Traditional Floppy Diskette

  6. Types of Floppies • High capacity • Known as a floppy-disk cartridge • Require special disk drives • Three well known types • Zip disks ,100MB, 250MB, 750MB • HiFD disks, 200MB, 720MB • SuperDisks, 120MB, 240MB

  7. Hard Disks • Use thicker, metallic platters for storage • Faster than a floppy diskette • Large capacity • Sensitive instruments

  8. Materials that Cause a Head Crash

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

  10. PC Card Hard Disks Hard-Disk Cartridges • Removable hard disks • Used to complement internal hard disk • Large capacity

  11. Hard-Disk Packs • Removable • Massive storage capacity • Common in mainframes

  12. Hard-Disk Pack

  13. Performance Enhancements • Disk caching • Redundant arrays of inexpensive disks (RAID) • File compression and decompression

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

  15. 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

  16. 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

  17. 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

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

  19. Solid-State Storage • Flash memory cards • Widely used • Can be used to record MP3 music files • Key chain hard drives • Key chain flash memory devices • Connects to a USB port

  20. Internet Hard Drives

  21. 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

  22. The End of Chapter 8

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