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traditional raid is much to expensive to run on a standard workstation.
a decent raid card can run you $1000 easy.
like cleo mentioned there is firewire raid (i know it is builtin to the new apple computers, not sure if it will run on a windows machine) firewire raid is becoming a lot more popular for applications that rely heavily on the hard disk (such as video editing) because you can setup a stripe (where all the drivers are use in parallel) which provides a HUGE increase in both reading and writing data. the downside is that if one drive fails, all or nearly all of your data will be lost. you can setup a parity to run on a dedicated disk or have it run on all the disks in the array, but this gets extremely costly if you need a lot of disk space.
there are also physical limitations to the raid card itself, and at some point you will need to increase the number of cards in your system in order to maintain a decent level of performance.
like i said, i would not recommend it for everyday machines as it would be extreme overkill and very costly. if you have a niche for it to fill, it can be a great tool.
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