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Slow write speed with RAID 0 - Sun Ultra 40 M2

I made a RAID 0 based on two disks:

I installed WinXp x64 on it and I have no problems using it, but write speed is very slow (about 7MB/sec). While I'm copying on that RAID system freezes, but CPU is almost idle.
Read speed is all rigth.
I updated bios to version 1.25, installed the newest nVidia drivers (nvidia chipset driver ver 20.14)
I tried to turn off disk cashing in bios but it didn't help.
Disk do not have bad sectors.

I even boot the computer from pen drive with fedora linux distribution, and write speed results were the same.

What else I can do? What is the cause?
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