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STORAGE (CHARACTERISTICS (Storage is non-volatile; it does not lose its …

- - - - Devices that store data in the form of tiny
        magnetised dots. These dots are created, read
        and erased using magnetic fields created by
        very tiny electromagnets.
      - Examples of magnetic storage are:
        – Hard Disk
        – Tape
      - Hard Disk
        
        • Storage device that contains one or more
        inflexible, circular platters that use magnetic
        particles to store data, instructions and
        information.
        • Hard disk stores operating system, application
        software, users’ data and information, and
        backup.
        
        • Characteristics of hard disk:
        – Capable to store large amount of data.
        – Direct access device; a file can be access
        randomly, not following the sequence it is stored.
        – Faster data access compared to tape.
      - Tape
        
        Magnetically coated ribbon of plastic capable
        of storing large amount of data.
        • Tape is mainly used for storing backup data.
        
        Characteristics :
        – Capable to store large amount of data.
        – Sequential access device; a file have to be
        accessed in sequence.
        – Slower data access compared to hard disk.
    - - Optical Disc
        
        • Storage media that consists of flat, round,
        portable disc made of metal, plastic and
        lacquer that is written and read by a laser.
        • Stores data in deformities on the surface of a
        circular disc and reads this data by
        illuminating the surface with a laser diode and
        observing the reflection.
        
        • Types of optical disc are:
        – Compact Disc (CD)
        – Digital Video Disc (DVD)
        – Blu-ray Disc (BD)
        
        Compact Disc (CD)
        
        A type of optical disc used to store data,
        songs, drivers, and program files.
        
        Types of CD:
        – CD-ROM
        – CD-R
        – CD-RW
        
        Digital Video Disc (DVD)
        
        A type of optical disc used to store videos,
        films, and large programs.
        • Higher storage capacity and better image
        quality compared to CD.
        
        Types of DVD:
        – DVD-ROM, DVD-R, and DVD-RW
        
        Blu-Ray Disc
        
        A type of optical disc used to store highdefinition
        and ultra high-definition videos and
        movies.
        
        It uses a blue laser instead of a red laser to
        read and write data on the disc.
    - - Flash memory storage is storage media that
        uses solid-state chip that maintains stored
        data without any external power source.
        • commonly used in portable electronics and
        removable storage devices.
        • More durable and shock resistant than other
        types of secondary storage because it contains
        no moving parts.
      - Types of flash memory storage
        
        – USB flash drive
        • Flash memory storage that users plug in a USB port on
        computers or mobile devices.
        
        – Memory card
        • Flash memory storage that users insert and remove
        from a slot in personal computer, smartphone, digital
        camera, or card reader/writer.
        
        • Examples: CompactFlash, microSD, Memory Stick Micro
        
        – Solid state drive (SSD)
        • Flash memory storage that offers faster data transfer
        rate, used in all types of computers and mobile devices.
        • May eventually replace storage media with moving
        parts such as hard disk and optical disc.