Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 52 views

    CSE Computer Memory

    Uploaded by

    Usman Dastgir
    This document discusses different types of computer memory. It defines computer memory as any physical device that can store information temporarily or permanently. It describes primary memory, which includes RAM and ROM that the CPU can directly access, and secondary memory like hard drives, CDs, DVDs, and USB drives for permanent storage. The key difference between primary and secondary memory is that primary memory is volatile and can be directly accessed by the CPU, while secondary memory is non-volatile but requires data to be copied to primary memory before the CPU can access it. Memory is measured in bits, bytes, kilobytes, megabytes, and gigabytes.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd

    CSE Computer Memory

    Uploaded by

    Usman Dastgir
    52 views20 pages
    This document discusses different types of computer memory. It defines computer memory as any physical device that can store information temporarily or permanently. It describes primary memory, which includes RAM and ROM that the CPU can directly access, and secondary memory like hard drives, CDs, DVDs, and USB drives for permanent storage. The key difference between primary and secondary memory is that primary memory is volatile and can be directly accessed by the CPU, while secondary memory is non-volatile but requires data to be copied to primary memory before the CPU can access it. Memory is measured in bits, bytes, kilobytes, megabytes, and gigabytes.

    Original Description:

    sha ka lala ka

    Original Title

    CSE-Computer-Memory-PPT

    Copyright

    © © All Rights Reserved

    Available Formats

    PPTX, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    This document discusses different types of computer memory. It defines computer memory as any physical device that can store information temporarily or permanently. It describes primary memory, which includes RAM and ROM that the CPU can directly access, and secondary memory like hard drives, CDs, DVDs, and USB drives for permanent storage. The key difference between primary and secondary memory is that primary memory is volatile and can be directly accessed by the CPU, while secondary memory is non-volatile but requires data to be copied to primary memory before the CPU can access it. Memory is measured in bits, bytes, kilobytes, megabytes, and gigabytes.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    52 views20 pages

    CSE Computer Memory

    Uploaded by

    Usman Dastgir
    This document discusses different types of computer memory. It defines computer memory as any physical device that can store information temporarily or permanently. It describes primary memory, which includes RAM and ROM that the CPU can directly access, and secondary memory like hard drives, CDs, DVDs, and USB drives for permanent storage. The key difference between primary and secondary memory is that primary memory is volatile and can be directly accessed by the CPU, while secondary memory is non-volatile but requires data to be copied to primary memory before the CPU can access it. Memory is measured in bits, bytes, kilobytes, megabytes, and gigabytes.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    You are on page 1of 20

    Computer

    Memory
    Content
     What is Computer Memory?
     Why is memory important or needed for a computer?
     Types of Computer Memory
     Primary Memory
     Secondary Memory
     Primary Vs Secondary Memory
     Memory Units
     References
    What is Computer Memory
     Computer memory is any physical device capable
    of storing information temporarily, like RAM
    (random access memory), or permanently, like
    ROM (read-only memory).
     Memory devices utilize integrated circuits and are
    used by operating systems, software, and
    hardware.
    Why is memory important or needed
    for a computer?
     Each device in a computer operates at different speeds
    and computer memory gives your computer a place to
    quickly access data.
     If the CPU had to wait for a secondary storage device,
    like a hard disk drive, a computer would be much
    slower.
    Types of Computer Memory

     Cache Memory
     Primary Memory/Main Memory
     Secondary Memory
    Primary Memory
     This is the main memory of the computer. CPU can
    directly read or write on this memory. It is fixed on
    the motherboard of the computer.
     Primary memory is further divided in two types:
    1.RAM(Random Access Memory)
    2.ROM(Read Only Memory)
    RAM(Random Access Memory)

     RAM is a temporary memory. The information stored


    in this memory is lost as the power supply to the
    computer is turned off. That’s why it is also called
    Volatile Memory.
     It stores the data and instruction given by the user and
    also the results produced by the computer temporarily
    ROM(Read only Memory)
     Information stored in ROM is permanent in nature,i.e., it
    holds the data even if the system is switched off.
     It holds the starting instructions for the computer. ROM
    cannot be overwritten by the computer. It is also called
    Non-Volatile Memory.
    Secondary Memory
     This memory is permanent in nature. It is used to store
    the different programs and the information
    permanently (which were temporarily stored in
    RAM). It holds the information till we erase it.
     Different types of secondary storage devices are:
    1. Hard Disc, Compact Disc,
    2. DVD, Pen Drive,
    3. Flash Drive, etc.
    Hard Disc Drive
     Hard disk drive is made up of a series of circular disks
    called platters arranged one over the other almost ½
    inches apart around a spindle.
     Disks are made of non-magnetic material like
    aluminum alloy and coated with 10-20 nm of magnetic
    material.
    CD Drive
     CD stands for Compact Disk. CDs are circular disks
    that use optical rays, usually lasers, to read and write
    data.
     They are very cheap as you can get 700 MB of storage
    space for less than a dollar. CDs are inserted in CD
    drives built into CPU cabinet.
     They are portable as you can eject the drive, remove the
    CD and carry it with you.
    DVD Drive
     DVD stands for Digital Video Display. DVD are
    optical devices that can store 15 times the data held
    by CDs.
     They are usually used to store rich multimedia files
    that need high storage capacity. DVDs also come in
    three varieties – read only, recordable and rewritable.
    Pen Drive
     Pen drive is a portable memory device that uses
    solid state memory rather than magnetic fields or
    lasers to record data.
     It uses a technology similar to RAM, except that it is
    nonvolatile. It is also called USB drive, key drive or
    flash memory.
    Blu Ray Disk
     Blu Ray Disk (BD) is an optical storage media used to
    store high definition (HD) video and other multimedia
    filed.
     BD uses shorter wavelength laser as compared to
    CD/DVD. This enables writing arm to focus more
    tightly on the disk and hence pack in more data. BDs
    can store up to 128 GB data.
    Primary Vs Secondary Memory
    Parameter Primary memory Secondary memory
    The primary memory is
    The secondary memory is
    Nature categorized as volatile &
    always a non-volatile memory.
    nonvolatile memories.
    Secondary memory is known
    These memories are also called as a Backup memory or
    Alias
    internal memory. Additional memory or
    Auxiliary memory.
    Data cannot be accessed
    directly by the processor. It is
    Data is directly accessed by the
    Access first copied from secondary
    processing unit.
    memory to primary memory.
    Only then CPU can access it.
    It's a volatile memory meaning It's a non-volatile memory so
    Formation data cannot be retained in case that that data can be retained
    of power failure. even after power failure.
    Memory Units

     Data in the computer’s memory is represented by


    the two digits 0 and 1.
     These two digits are called Binary Digits or Bits.
     A bit is the smallest unit of computer’s memory.
     Bits=0,1
    1 Byte= 8 bits(e.g,11001011)
    1 KB(kilobyte)     = 1024 Bytes
    1 MB(megabyte) = 1024 KB
    1 GB(Gigabyte)   = 1024 MB
    1 TB(Terabyte)    = 1024 GB
    References

     www.google.com
     www.wikipedia.com
     www.studymafia.org
     www.pptplanet.com
    Thanks

    You might also like