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COMPUTER MEMORY & DATA STORAGE

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COMPUTER MEMORY & DATA STORAGE. ROM. ROM is short for Read Only Memory. It is permanent , long-term memory which cannot be erased or changed in any way; It is also known as “Non-Volatile Memory” because it doesn’t disappear after the computer is switched off. ROM cont’d.

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Presentation Transcript
slide2
ROM
  • ROM is short for Read Only Memory.
    • It is permanent, long-term memory which cannot be erased or changed in any way;
    • It is also known as “Non-Volatile Memory” because it doesn’t disappear after the computer is switched off.
rom cont d
ROM cont’d
  • ROM chips instruct the computer how to load the operating system from the hard drive into the computer’s memory.
  • Don’t confuse the hard drive with ROM – the hard drive is an internal backing store (storage device).
slide4
RAM
  • RAM (Random Access Memory) is:-
    • Temporary, short-term working memory;
    • Only works when the computer is turned on;
    • It is also known as “Volatile Memory” because data disappears if the power is switched off.
  • Each time you start a program e.g. MS Word, it is loaded into RAM.
  • The amount of RAM influences processing power, speed and how many programs can run at the same time.
    • Many computers are now sold with 128 or 256 MB of RAM.
measurement of memory
Measurement of Memory
  • Computer memory is measured in bytes.  A single byte is made up of a series of 1\'s and 0\'s, which are known individually as binary digits or “bits”. 
  • This is the way the computer communicates and stores information.  With each keystroke or character a byte of memory is used.
    • 8 bits = 1 byte
    • 1024 bytes = 1 kilobyte
    • 1024 kilobytes = 1 megabyte
    • 1024 megabytes = 1 gigabyte
data storage internal backing store
Data Storage - Internal Backing Store
  • Hard Disks are the main internal backing store usually found inside computers.
  • The main benefit of hard drives is that they have a large storage capacity – 20 gigabytes or more. (1 Gb = 1024 Mb).
external backing store
External Backing Store
  • USB Pens are a common externalbacking store, however only store up to 8GB of data.
  • When are they useful?
    • Excellent for transferring files of data from one machine to another and for backing up important files stored on your hard disk.
external backing store1
External Backing Store
  • CD-ROM (Compact Disk Read Only Memory) disks are optical disks that use the same technology as musical compact disks.
  • What can they be used for?
  • As CD-ROMs are much bigger than floppy disks, they can be used for multimedia applications such as encyclopedias and can store pictures, sounds and video clips.
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