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Secondarystoragedevice

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Information regarding Secondary Storage devices

Information regarding Secondary Storage devices

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  • 1. SECONDARY STORAGE DEVICES Section I : Chapter No. 4
  • 2. What are Basic Hardware of a Personal Computer?
    • Monitor
    • Motherboard
    • CPU (Microprocessor)
    • Primary storage (RAM)
    • Expansion cards
    • Power supply
    • Optical disc drive
    • Secondary storage (Hard disk)
    • Keyboard
    • Mouse
    Hardwares of Personal Computers Figure 1. Basic hardware of a PC. (Wikipedia, 2007a)
  • 3. Classification of Hardware Hardwares of Personal Computers Figure 2. Classification of Hardware. Input Devices 1 Processing Unit 2 Storage Devices 3 Output Devices 4 Key: Data flow
  • 4. What are Types of Storage Devices? Hardwares of Personal Computers Figure 3. Classification of storage devices. Storage Devices Primary Storage Secondary Storage Read-Only Memory (ROM) Random-Access Memory (RAM)
  • 5. What is Secondary Storage?
    • Secondary storage is computer memory that is not directly accessible to the CPU of a computer, requiring the use of computer's input/output channels.
    • It is used to store data that is NOT in active use.
    • It is usually slower than primary storage but it always has higher storage capacity.
    • It is non-volatile. Data remains unchanged even after switching off the computer.
    Hardwares of Personal Computers
  • 6. Secondary Storage
    • 3.5” Floppy Disk
    • Data can be read or write
    • Data capacity: 1.44 MB
    Hardwares of Personal Computers Figure 4. A floppy disk.
  • 7. Secondary Storage
    • Hard Disk
    • Data can be read or write
    • Speed of disk rotation usually 7200 rpm
    • Data capacity : 80GB, 160GB, 250GB, 300GB etc
    Hardwares of Personal Computers Figure 5. A Hard disk.
  • 8. Secondary Storage Hardwares of Personal Computers CD-Rom CD-R CD-RW Data can be Read only Read but write once Read & write Data capacity (MB) 650 650 650
  • 9. Secondary Storage Hardwares of Personal Computers DVD ( Digital Versatile Disk or Digital Video Disk ) DVD-R / DVD+R DVD-RW / DVD+RW Data can be Read only Read but write once Read & write Data capacity (GB) Single layer: 4.7 Double layer: 8.5 Single layer: 4.7 Double layer: 8.5 Single layer: 4.7 Double layer: 8.5
  • 10. What are the Different Between CD and DVD?
    • A compact disc [sometimes spelled disk ] (CD) is a small, portable, round medium made of molded polymer for electronically recording, storing, and playing back audio, video, text, and other information in digital form
    • DVD is an optical disc technology with a 4.7 gigabyte storage capacity on a single-sided, one-layered disk, which is enough for a 133-minute movie. DVDs can be single- or double-sided, and can have two layers on each side; a double-sided, two-layered DVD will hold up to 17 gigabytes of video, audio, or other information. This compares to 650 megabyte s (.65 gigabyte) of storage for a CD-ROM disk.
    • DVD was originally said to stand for digital video disc , and later for digital versatile disc .
    Hardwares of Personal Computers
  • 11. Secondary Storage Hardwares of Personal Computers Figure 6. A C-R disk. Figure 7. A CD-RW disk.
  • 12. Secondary Storage Hardwares of Personal Computers Figure 8. A DVD-R disk. Figure 9. A DVD+RW disk.
  • 13. Secondary Storage
    • USB flash drives
    • They are flash memory data storage devices integrated with a USB interface.
    • They are typically small, lightweight, removable and rewritable .
    • Data capacity: 512MB, 1GB, 2GB, 4GB, 8 GB, 16GB etc
    • USB flash drives also are called thumb drives, jump drives, pen drives, key drives, tokens, or simply USB drives .
    Hardwares of Personal Computers Figure 10. An USB flash drive.
  • 14. Secondary Storage
    • Memory Cards
    • e.g. SD card, CF card, xD card, Microdrive, Memory Stick
    • Data can be read or write
    • Data capacity: 512 MB, 1GB, 2GB, 4GB, 16GB etc
    Hardwares of Personal Computers Figure 11. A SD card.
  • 15. Various Types of Memory Cards Hardwares of Personal Computers Figure 12. Various types of memory cards. SM Card SD Card CF Card xD card Memory Stick Microdrive
  • 16. THANK YOU Hardwares of Personal Computers Suhas Subramanian Mangesh Tilve Anita Rajan Usha Sawant Rachna Amarnani Shilpa Shinde

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