Motherboard is an Asus P8Z68 v-pro, Z68 chipset but I'm not sure what the ICH is?
The hard drives I was trying to use are 4 western Digital 256 GB sata2 drives, so total capacity of the raid0 array is only 1 tb. Note I succesfully tested with 2 seagate 1.5tb drivers in raid0 (formats to 2.7tb array) which I find strange that the RST software shows the array size as 2.7tb even though windows7 will only allow the partition to be 2tb max as you mentioned. I worry that this may cause some problems if I were to continue using this array?
After trying the 4 drive array around 10 times I tried with the 2 seagate drives (even though I don't want to use them in this system) and it worked without error.
Interesting to note that with the 4 drive array the online Intel driver update utility would not recogonize the ICH as even existing (so the list would show only 4 items, yet with the 2 drives mentioned above the online tool recognized and offered updates to the RST software. I really don't understand why the 4 drive array is rejected.
Full system spec:
Asus P8Z68 v-Pro
8 gb Mushkin ddr3 ram pc16000
Antec 1200ax PSU
AMD 6990+6970 gpu
3 23" 1080p monitors