How Computers Store Data

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# How Computers Store Data - PowerPoint PPT Presentation

How Computers Store Data. TERMS. discrete data continuous data, bi-stable device, number system, binary number system, denary number system human-readable data machine –readable data natural numbers whole numbers, integers real numbers, magnitude base, number, digit. QUIZ.

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### How Computers Store Data

TERMS
• discrete data
• continuous data,
• bi-stable device,
• number system,
• binary number system,
• denary number system
• natural numbers
• whole numbers, integers
• real numbers, magnitude
• base, number, digit
QUIZ
• Classify each set of data as discrete or continuous.
• 1) The number of suitcases lost by an airline.
• 2) The height of corn plants.
• 3) The number of ears of corn produced.
• 4) The number of green M&M's in a bag.
• 5) The time it takes for a car battery to die.
• 6) The production of tomatoes by weight.
• 1) Discrete. The number of suitcases lost must be a whole number.
• 2) Continuous. The height of corn plants can take on infinitely many values (any decimal is possible).
• 3) Discrete. The number of ears of corn must be a whole number.
• 4) Discrete. The number of green M&M's must be a whole number.
• 5) Continuous. The amount of time can take on infinitely many values (any decimal is possible).
• 6) Continuous. The weight of the tomatoes can take on infinitely many values (any decimal is possible).
Why do computers store data?
• For processing
• Temporarily
• using Random Access Memory (RAM)
• For later use
• permanently or semi-permanently
• using secondary storage devices and media

Computers do not store data the way we see it, but in the form of binary digits

Why binary digits?
• The computer is an electronic device
• The computer is a digital device
• Electronic
• the computer uses electricity to work
• Digital
• the use of binary digits to store data
The computer’s memory
• The computer’s memory is made up of tiny two-state electronic devices called bi-stable devices.
• A bi-stable devicecan exist in only one of two possible states i.e. on or off.
• Bi-stable devices respond to the presence or absence of an electric current:
• Absence of an electric current - off state
• Presence of an electric current - on state
Binary digits and data
• Binary digITS (BITS)
• 1  ON
• 0  OFF
• This is why data is stored in the form of binary digits (bits)
• Input data is converted to binary digits in order to be processed and stored
Binary digits and data (cont’d)
• Information for the user is converted from binary digits into human-readable form
• Every character on the keyboard can be represented internally using a combination of 8 bits or 1 byte
• The computer uses various representation schemes to convert data to binary form

Numeration/number system: any notation for the representation of numbers

• human-readable format is a representation of data or information that can be naturally read by humans
Homework
• Logon to IT for CSEC
• Read and take notes on pages 55 – 56
Homework (cont’d)
• All ___________ that is _________ into a computer system must be

_________ temporarily in ________________. The computer’s

___________ is made up of ___________________ which can exist in only one

of _______ possible __________. As a result, the _________________ one and

zero are used to represent the ________ and __________ states respectively.

___________ data is therefore _____________ to its binary __________________ in order to be

_______________ and ____________. It is then _____________ from ______________ back to

its original form in order to be ___________ to the user.Fill in the blanks in the above paragraph using the words given in the list below. Remember that a word may be used more than once.Main memory, data, representation, memory, stored, bistable devices, converted, states, output, two, binary digits, input, on, processed, off, binary.