RAID not working on my computer

[Lounds]

Hello I have an Asus motherboard that I am using the onboard AMD raid. I made the RAID in October after I had a hard drive failure. I am only using RAID 1 just for hard drive failure backup, not really for data backup.  My problem is that a few weeks ago I noticed during a reboot the RAID was no longer recognizing one of the drives. Weird thing though is that Windows has detected the missing drive.  How could I fix this?

[bgibbz]

Check SMART data, it's possible that one of the drives has enough bad sectors that the RAID controller won't recognize even if the drive is technically still accessible. 

[Min Ki Jung]

That doesn't make sense. If you set up RAID 1 using multiple drives, then the drives will be recognized by Windows as one single drive. If the Windows is detecting the "missing drive" and it is not included in your RAID setup, then my guess is that it was never included in the RAID from the beginning.

[Lounds]

On 2/24/2017 at 11:32 PM, Min Ki Jung said:

That doesn't make sense. If you set up RAID 1 using multiple drives, then the drives will be recognized by Windows as one single drive. If the Windows is detecting the "missing drive" and it is not included in your RAID setup, then my guess is that it was never included in the RAID from the beginning.

Well I believe the RAID controller just must have made an error. For months the computer recognized them as one drive and all the files are the same. Only recently they are different, with one drive being 330 GB free and the other 315 GB free.  However I recently restarted my computer and noticed the drive in the options to add to a new RAID logical disk, but not the original logical disk it was assigned to. Needless to say I do not think I would use this RAID controller again as it is very unreliable. Is there a good way to move my data from this RAID set up to another?

[Lounds]

So I still do not know what happened logical disk that had both hard drives in RAID 1.  Maybe the hard drive that went missing from the logical drive is starting to go bad or the AMD RAID controller was not made well.  However I have created a new logical disk with the drive that went missing in the first logical disk and a new hard drive. Also found out that this was the only way to clone my system, since you cannot clone a RAID drive to a SATA drive.