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2.1 SYSTEM CONCEPT (Data Representation (Data (Collection of unprocessed…
2.1 SYSTEM CONCEPT
COMPUTER
An electronic device that accepts data (input), process data, produces information (output) and store the information for future use
COMPUTER SYSTEM
A complete, working computer that includes operating system, software and hardware which are necessary to make the computer function
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Data Representation
Data
Collection of unprocessed items (number,symbol)
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Computer represent data by using two unique binary digits 1 and 0 to represent the two states on and off
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Storage Capacity
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Tape drive - afew hundred to several gb
Diskette - 1.44mb
Hard disks - External (4Tb or more ) Internal ( 1Tb or more)
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Solid state drive - 16gb-256gb
Compact Flash- 512mb to 100gb
Secure digital-512mb to 8gb
SDHC - 4gb to 32gb
XD Picture Card- 256mb to 2gb
Usb flash drive - 512mb to 100gb