You only need to back up the drive Windows is on. The reason I advised this is because scanning the disk can put additional stress on the drive and if it's marginal you may lose the data currently on it. I'm pretty sure your disk is okay as you were able to open folders easily with fatdog but I just wanted to make sure you know the risks. I don't have much experience with RAID but if it was configured in hardware then I doubt the RAID would be broken with a new Windows 10 install. The problem with RAID 0, striped is if one drive fails you lose everything on both drives. If one of your drives in the RAID fails can you afford to lose everything on your RAID 0 setup?
- RAID 0 offers great performance, both in read and write operations. There is no overhead caused by parity controls.
- All storage capacity is used, there is no overhead.
- The technology is easy to implement.
- RAID 0 is not fault-tolerant. If one drive fails, all data in the RAID 0 array are lost. It should not be used for mission-critical systems.
The MB is a UEFI board so in order for UBCD to boot UEFI needs to be set to Legacy or CSM boot. It's possible the MB can automatically detect if the device needs to boot CSM or UEFI. I believe ASUS uses F8 to access the boot menu.
Edit: Personally, from what you posted regarding the contents of your D and E drives, I would back up the data first on the RAID drives even if it required uploading to some kind of cloud storage. Once the data from both drives is backed up I would break the RAID and have two separate drives. Any data you cannot afford to lose should be backed up to two separate locations preferably one being offsite.
Edited by JohnC_21, 06 December 2016 - 12:27 PM.