Information Technology for Managers Session 3 By  Prof. Arun Mishra
Learning Objectives <ul><li>In this chapter your will learn about: </li></ul><ul><ul><li>Classification of Secondary Stora...
Limitations of Primary Storage
Secondary Storage <ul><li>Stores information </li></ul><ul><li>Non-volatile, permanent storage </li></ul><ul><li>Character...
Classification of Secondary Storage
Sequential-access Devices
Direct/Random-access Devices
Magnetic Tape <ul><li>Sequential access & Very large capacity </li></ul><ul><li>Storage capacity is measured in  bytes per...
Storage Organization
Storage Organization
Types of Magnetic Tapes <ul><li>Tape cartridges </li></ul>
Types of Magnetic Tapes <ul><li>2. Magnetic tape reels </li></ul>
Magnetic Disks
Storage Organization
Types of Magnetic Disks <ul><li>Floppy Disks </li></ul><ul><ul><li>Portable and removable </li></ul></ul><ul><ul><li>Flat ...
Types of Magnetic Disks <ul><li>Hard Disks </li></ul><ul><ul><li>Metallic disks </li></ul></ul><ul><ul><li>Fast retrieval,...
Optical Disks
Storage Organization
Access Mechanism
Access Mechanism
Types of Optical Disks <ul><li>CD-ROM (Compact Disk Read Only Memory) </li></ul><ul><li>CD-R (Compact Disk Recordable) </l...
Memory Storage Devices <ul><li>There are three types of memory storage devices: </li></ul><ul><ul><li>Flash Drive (Pen Dri...
Flash Drive (Pen Drive)
Flash Drive (Pen Drive)
Memory Card (SD/MMC)
RAM Disk
 
 
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Lecture 3

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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

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

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