Computer memory data storage
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COMPUTER MEMORY & DATA STORAGE PowerPoint PPT Presentation


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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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COMPUTER MEMORY & DATA STORAGE

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Computer memory data storage

COMPUTER MEMORY & DATA STORAGE


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

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).


Computer memory data storage

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

  • Floppy disks are a common externalbacking store, however only store up to 1.44 Mb of data.

  • When are they useful?

    • Excellent for transferring small files of data from one machine to another and for backing up important small 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.

  • They store up to 700 Mb of data and a laser beam is used to read the data off the disk.

  • What can they be used for?

  • As CD-ROMs are much bigger than floppy disks, they can be used for multimedia applications such as encyclopaedias and can store pictures, sounds and video clips.


3 5 inch floppy disk

3.5 inch Floppy Disk

Head Contact Area

Positioning & Drive Hole

Metal Hub

Centre Hole

Disk inside plastic case

Write Protect Notch


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