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RAID-0 Read Speeds lower than standalone drive

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Hey, I just ran HDTach, and noticed that the average read speed on my RAID-0 array is really low, lower than my standalone drive and comparable to my RAID-1 array. Here were the results:

RAID0 - Average Read Speed - 84.2 MB/s
Burst Speed - 340.4 MB/s

RAID1 - Average Read Speed - 71.4 MB/s
Burst Speed - 198.1 MB/s

Standalone - Average Read Speed - 91.4 MB/s
Burst Speed - 244.9 MB/s

The two raid arrays are both on a pair of seagate barracuda 320GB's, and the standalone disk is a 1TB barracuda. I'm running Vista32 and the drives are on an ICH7R controller.

Vista doesn't seem to allow me to enable Write Caching on any of my drives, even the standalone drive. Whenever I check the box, it's unchecked the next time I open the window.

Any suggestions would be appreciated.

Mobo: ASUS P5W DH Dlx 1901
CPU: C2D E6600 @ 3.4GHz

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