6.1.1+Identify+the+resources+that+need+to+be+managed+within+a+computer+system

= Main Memory = → This is RAM Main Memory (AKA internal memory or primary storage). It is used to store data temporarily. RAM is volatile (meaning that when turned off all data in the RAM is lost). The main memory is used to store data while it is being processed by the CPU. It can be input and read very quickly.

RAM (Random Access Memory)
The computer divides up the information you have and splits into temporary information that needs to be access quickly by the operating system and permanent information that needs to be stored in the hard drive. Because it only stores data temporarily it means that the RAM is volatile (when the computer is turned off all the data stored in the RAM is erased).

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ROM (Read Only Memory)
The microprocessor can read from ROM, but it can’t write or modify it. ROM is permanent. Often, ROM chips contain special instructions for the computer, like the BIOS.

Cache
This is a high speed storing mechanism. There are two types of caching used: memory caching and disk caching. The memory caching is a high portion of the memory used for really fast access to memory. It is also known as SRAM and can be considered a faster version of RAM. It is effective for programs or data used over and over again. Depending on the speed of the cache and where it is located it is given different levels (used to differentiate them, just like names). The most common types of memory cache are L1 and L2. The disk caching works just like the memory caching but instead of working for the RAM it works for disk (this being the hard-drive).



__Links:__ [|__http://www.igcseict.info/theory/__] [|__http://info.nsiserv.com/network-support-computer-services-CT/bid/28779/What-is-RAM-A-quick-summary-of-what-RAM-is-and-how-upgrading-helps-you__]

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=Bandwidth=

Bandwidth is the measure of communication channels’ attributes i.e. how much data it can carry. In other words, it is the measure of the capacity of communication channels. In terms of digital data, bandwidth determines the maximum amount of data that can travel through the medium over any given time.



Bandwidth is measured by bits per second where the fewer bits per second a channel capacity is, the slower the channel is. When a computer is connected to a remote server somewhere, the part of the connection that has the lowest bandwidth, which becomes the bottleneck, determines the speed of data transfers. Therefore, the lowest bandwidth determines the maximum speed of connection between two machines.

Nowadays, bandwidth connections are measured in kilobits per second (Kbps) or megabits per second (Mbps). It is important to acknowledge the bandwidth as it tells what you can do in terms of real-time services i.e. downloading photos, videos and audio. Here are the bandwidths of some connections to the internet:

• 100Mbps – Advanced
=Screen Resolution=

In computers, resolution is the number of pixels (individual points of colour) contained on a display monitor, expressed in terms of the number of pixels on the horizontal axis and the number on the vertical axis. The sharpness of the image on a display depends on the resolution and the size of the monitor. The same pixel resolution will be sharper on a smaller monitor and gradually lose sharpness on larger monitors because the same number of pixels are being spread out over a larger number of inches.

Display resolution is not measured in dots per inch as it usually is with printers. However, the resolution and the physical monitor size together do let you determine the pixels per inch. Typically, PC monitors have somewhere between 50 and 100 pixels per inch.

Secondary Storage Secondary Storage is a non-volatile storage that is typically used for back up.

Secondary storage is required in a computer system for three reasons:
 * The content of memory is usually volatile
 * The capacity of memory is limited´
 * Memory is more expensive than secondary storage

All of the following devices are used for secondary storage: magnetic tapes, CDs, DVDs, DVD-RAM discs, HD DVD discs, Blu-Ray discs, hard discs, memory sticks and flash memory

These different devices all have different storage capacities and data access speeds: There are three types storage devices: magnetic, optical and solid-state. The difference in between them is how they store data.


 * Magnetic storage media and devices store data in the form of tiny ** magnetised dots ** . These dots are created, read and erased using magnetic fields created by very tiny ** electromagnets **.
 * Optical storage devices save data as patterns of ** dots ** that can be read using ** light ** . A ** laser beam ** is the usual light source.
 * Solid-state storage devices are based on ** electronic circuits ** with ** no moving parts **

The whole of section 3 on this website goes over all of secondary storage so for more information visit the following website: [] = = =Processor speed= = = Processor speed is one of the most important statistics for a computer, you can think of the processor speed as the ‘brain speed’ of your computer. The larger your processor speed the more programs you can run on your computer, and the faster and better they will run. Nevertheless if your have a very fast processor but the rest is unbalanced, it wouldn’t work very effectively. Processor speed varies a lot, depending on what device you’re using and its quality. The recent “intel core i7” processor speed varies from 2.8GHz to 4.0GHz.



Links:

http://www.processorspeed.org/

http://www.intel.com/content/www/us/en/processors/core/core-i7-processor.html

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