In a RAID 1, Intel(R) Rapid Storage Technology, the verify process will indicate verification errors in the event of Bad blocks identified, which will be repaired by reassigning the bad blocks; and when data on the mirror drive is compared to the data on the source drive, this is repaired by overwriting the data on the mirror drive with the data on the source.
Keep in mind that Intel(R) Rapid Storage Technology will only check the integrity of the volume and not the cause of this. So this will not check the physical drives health.
So this may be triggered by problems on the power/data cabling, bad SATA controller, drive(s) problems or operating system issues. You will need to check with the corresponding hardware manufacturer to check for integrity.
I would like a clear answer from Intel on this question also.
Here is a bad answer from Intel that lacks clarity or reassurance. It is as if the drivers and RAID controllers Intel has designed offer no protection at all: