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  • Secondary storage is – stores programs and data nonvolatile as opposed to volatile (temporary) storage (RAM) which is lost when power shut off to computer. Media – actual physical material that hold data Capacity – amount of data the storage medium can hold Access time – amount of time to retrieve and write data
  • Sequential access because they have to be fast forwarded or rewound before a specific location can be reached. A common sequential access method of Two forms of tape storage Magnetic tape cartridges, also called magnetic tape streamers Magnetic tape reels Tapes are run on magnetic tape drives or magnetic tape units

Lecture 3 Lecture 3 Presentation Transcript

  • Information Technology for Managers Session 3 By Prof. Arun Mishra
  • Learning Objectives
    • In this chapter your will learn about:
      • Classification of Secondary Storage.
      • Magnetic Tape
      • Magnetic Disk
      • Optical Disk
      • Memory Storage Devices.
  • Limitations of Primary Storage
  • Secondary Storage
    • Stores information
    • Non-volatile, permanent storage
    • Characteristics
      • Media
      • Capacity
      • Access time
  • Classification of Secondary Storage
  • Sequential-access Devices
  • Direct/Random-access Devices
  • Magnetic Tape
    • Sequential access & Very large capacity
    • Storage capacity is measured in bytes per inch ( bpi).
    • Data transfer rate is measured in bytes per second (bps) .
    • Commonly used for backing-up data
    • Medium is plastic ribbon usually ½-inch or ¼-inch wide & 50 to 2400 feet long.
    • Surface is coated with recording material that can be magnetized.
    • Data is recorded on the coated surface as tiny, invisible magnetized & non-magnetized spots.
  • Storage Organization
  • Storage Organization
  • Types of Magnetic Tapes
    • Tape cartridges
  • Types of Magnetic Tapes
    • 2. Magnetic tape reels
  • Magnetic Disks
  • Storage Organization
  • Types of Magnetic Disks
    • Floppy Disks
      • Portable and removable
      • Flat circular Mylar media
        • Magnetic charge on metal oxide film coating
      • Standard 2HD 1.44 MB
      • Parts
        • Tracks
        • Sectors
  • Types of Magnetic Disks
    • Hard Disks
      • Metallic disks
      • Fast retrieval, greater capacity
      • Read/write heads ride cushion of air .000001” thick
      • Three types
        • Zip/Bernoulli disk
        • Hard-disk pack
        • Winchester disk
  • Optical Disks
  • Storage Organization
  • Access Mechanism
  • Access Mechanism
  • Types of Optical Disks
    • CD-ROM (Compact Disk Read Only Memory)
    • CD-R (Compact Disk Recordable)
    • CD-RW (Compact Disk Read/Write)
    • DVD (Digital Video/Versatile Disk)
      • DVD-ROM
      • DVD-R
      • DVD-RAM or DVD-RW
  • Memory Storage Devices
    • There are three types of memory storage devices:
      • Flash Drive (Pen Drive)
      • Memory Card (SD/MMC)
      • RAM Disk
  • Flash Drive (Pen Drive)
  • Flash Drive (Pen Drive)
  • Memory Card (SD/MMC)
  • RAM Disk
  •  
  •