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RAID
RAID stands for Redundant Array of Independent Disks. Several different forms of RAID implementation have been defined. Each form is usually referred to as a "RAID level."
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RAID 0+1
Combines RAID 0 striping and RAID 1 mirroring. This level provides redundancy through mirroring.
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RAID-0
Block "striping" across multiple drives is provided, yielding higher performance than is possible with individual drives. This level does not provide any redundancy.
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RAID-1
Drives are paired and mirrored. All data is 100 percent duplicated on a drive of equivalent size.
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RAID-10
Combines RAID 0 striping and RAID 1 mirroring spanned across multiple drive groups. This level provides redundancy through mirroring.
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RAID-3
Data is "striped" across several physical drives. Maintains parity information which can be used for data recovery.
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RAID-5
Data is "striped" across several physical drives. For data redundancy, drives are encoded with rotated XOR redundancy.
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Ram
Random Access Memory.
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RAMDAC
Random Access Memory to Digital Analog Converter. A chip on videocard which turns digital signals to analog ones which can be outputed to a monitor.
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RDRAM
Rambus DRAM, a totally new DRAM architecture that has a huge ammount of memory bandwidth, however has a high latency penalty. RDRAM is best suited for processors that need high bandwidth like Pentium 4 processors
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Reflective LCD
Reflective LCD technology makes use of only the surrounding ambient light to illuminate the display. Beneath the surface of the display a rear polarizer is combined with a reflector assembly to bounce back ambient light. The technology really only works well in fairly bright light only. The colours are little different from what you might normally be used to, but the display is clear and readable so long as the text is highly contrasted to the background.
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Refresh Rate
The amount of times the monitor refreshes (redraws) the picture on the screen. Refresh rates above 75 Hz are recommended since anything lower will cause headaches after a prolonged period of time.
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Resistor
A device used to control current in an electric circuit by providing resistance.
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Resolution
The pixel size of a display. 800x600 has a horizontal width of 800 pixels while a 600 pixel vertical length.
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Rimm
Rambus memory module. [image]
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Risc
Reduced Instruction Set Computing, an architecture for an application-specific processor.
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Riser
A device that is an add from another card, takes up an expansion slot however doens't plug directly into the motherboard.
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RJ-11
Connector at the end of a standard telephone cable.
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RJ-45
Registered Jacks, sometimes described as RJ-XX. Series of telephone connection interfaces that are registered with the FCC. The most common telephone jack is the RJ-11 jack, which can have six conductors but usually is implemented with four. The RJ-11 jack is likely to be the jack that your household or office phones are plugged into from the ordinary "untwisted" wire that people are most familiar with. The RJ-45 is a single-line jack for digital transmission over ordinary phone wire, either untwisted or twisted. The interface has eight pins or positions.
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ROM
Read Only Memory, stores very little yet essential data that cannot be erased. Often used for BIOS's or firmware for devices.
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