Computing Hardware

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Input Devices
Hardware that allows data to be entered into a computer system e.g Keyboard, mouse
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Output Devices
Hardware that allows data to be output from a computer system e.g. Monitor, printer
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Secondary Storage Types
Magnetic - Hard disk Optical - CD, DVD, BlueRay Solid State - No moving parts, USB, External hard disk
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Secondary Storage
Non-volatile method for storing large amounts of data for long term use e.g. Hard disk, USB, SD card, Micro SD
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Secondary Storage - Durability
How tough the storage is, how easy it is to damage e.g. CD's can be scratched, Hard disk's are more durable
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Secondary Storage - Portability
How easy it is to move it e.g. CD's are easy to carry around, USB's are lighter. Hard disk's are heavy and inside the computer
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Secondary Storage - Reliability
Does the hardware work or does it break down easily. Can you rely on it
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Secondary Storage - Sizes
Magnet hard disks - large, capacity (GB/TB) Optical disks - (CD/DVD) holds large programs, videos, relatively slow but inexpensive 700mb (CD) 4.7GB(DVD) Flash (Solid-State) - Relatively inexpensive and good access times, can hold many GB of data
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Cache Memory
Volatile memory located as part of the CPU chip. Generally holds less data than RAM. It's very fast but manufacturing costs more than RAM.
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ROM
Non volatile. Holds the boot up program used when the computer first starts
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RAM
Volatile memory. Holds the most recent instructions that have been processed. Lack or RAM is a likely cause of performance issues.
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CPU
Processes instructions. Uses a fetch - decode - execute cycle
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Flash Memory
Solid-State memory used as low cost secondary storage in portable devices and as removable memory e.g. USB, SD card, Micro SD
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Cores
Dual core - This means two processing units in the CPU. Quad core - Four processing units in the CPU
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Clock Speed
Speed of the processor e.g. 4GHZ - this means the CPU can process 4 billion instructions per cycle/second
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Virtual Memory
An area on the hard disk used as memory. Used when the RAM is too small to deal with the amount of instructions. Effects the performance
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De Facto Standards
Standards that just develop by common use. They become the standard way of doing things e.g QWERTY keyboards, programmers using comments
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Open Standards
Standards that are publicly available. Open source software is open to everyone, experts can use and change it, no one is to blame if things go wrong e.g. Android, Linux
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Failover
Software keeps an eye on the health of systems. If it detects a problem it may switch over to another working system (mirror system) and keeps the system runnning
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Redundancy
Keeping a spare piece(s) of hardware in case one breaks. Making sure there is no system down time (or very little)
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Computer System IPOS
Anything that has a input, output device, processor and storage device
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Reliability
How reliable systems are - Unreliable systems may have legal impact, aircraft accidents, loss of data, loss of use of systems impacting on business
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Disaster Recovery
Planning what to do if there is a disaster (fire, flood, natural disaster). Making sure you detect, correct and prevent problems by backups, spare hardware, failover, backup power
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Down Time
When a computer system isn't running, the system is down. It is important to reduce the amount the system is down especially when we rely on them so much
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Other cards in this set

Card 2

Front

Hardware that allows data to be output from a computer system e.g. Monitor, printer

Back

Output Devices

Card 3

Front

Magnetic - Hard disk Optical - CD, DVD, BlueRay Solid State - No moving parts, USB, External hard disk

Back

Preview of the back of card 3

Card 4

Front

Non-volatile method for storing large amounts of data for long term use e.g. Hard disk, USB, SD card, Micro SD

Back

Preview of the back of card 4

Card 5

Front

How tough the storage is, how easy it is to damage e.g. CD's can be scratched, Hard disk's are more durable

Back

Preview of the back of card 5
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