I've been dealing with RAID 1 for quite some time without issue, but recently had a problem where the RAID would not rebuild within Windows 7. It would get to about 50% rebuild and then fail. I could select the drive to rebuild again and the same thing would happen. I was able to verify this problem on four identical models of brand new PCs (all from the same manufacturer). At one point I took a PC with fully functioning RAID 1, went into the CTRL -I interface, reset Drive 1 to non-RAID, then went into rebuild - the system detected the drive as eligible for rebuilding, I selected it, the interface showed "REBUILDING" then went into Windows to let it rebuild. It got to around 50% and then failed in the intel console. I ended up reinstalling Windows 7, and now it works fine. I even broke the RAID again and then let it rebuild to ensure the problem was solved. This ended up being the solution for all 4 PCs (i.e. reinstalling Windows 7 with the RAID driver recommended by the manufacturer). When I contacted the manufacturer to let them know about the issues their technical support claimed that you can only rebuild RAID on to a drive with no data. I have since done additional testing that proved this false (by rebuilding on to drives that were loaded with data), but was hoping to get an official INTEL response.
I had never have this problem about rebuilding if the drive was empty. Since there is a mirror drive, the Intel® Rapid Storage will create same data onto the other drive.
I have checked with engineering and they did not experience this type of issues in the past.