It now seems like Abit has finally managed to fix the Data Corruption problem on the NF7-S mainboard, this is their reply to Nordichardware. They have also replied to the thread on their forums which I posted about here two days ago.
"Here's the latest update for SATA RAID-0 broken issue on NF7-S mainboards. After co-working with Silicon Image for one week, we finally found the SATA RAID-0 broken issue was caused by some improper register values. We already tested latest beta driver from Silicon Image; which fixes the wrong register values and had been confirmed to solve SATA RAID-0 broken issue in ABIT lab. Silicon Image will provide us another official release driver and ABIT will release it to customers in a couple of days." UPDATE: Asus has a driver which fixes the problem, it works on the NF7-S also (confirmed by myself plus others on Abit forums) you can download the driver here (before downloading please read my note below)