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I have 8 IDE devices set up on my system, 4 HDD and 4 CD-Rom devices. Its a non raid system and since I work with a lot of digital and visual media, I need all the hard disk space I can get. Anyways I have all my HDD's set up on a promise TX2 controller and the CD-Rom devices on the Mobo's Primary and Secondary IDE channels.
The TX2 controller card is not that expensive and you can easily get one from any retail store for $39.99 or maybe for less if you order it online.
And again RAID is used not only for data protection/backup but also if you are doing lot of writes to your hard disk. The more hard disks you put in your RAID configuration (striping) the faster the writes.
Hope this helps!!
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