raid - Hard disk error in Intel Matrix Storage Manager

I have two hard disks, both 160GB, and with Intel Matrix Raid on these two disks, I created two volumes

• Volumne0 Raid1


• Volumne1 Raid0

Now, one of the hard disk shows error in the Intel Matrix Raid manager

Questions:

• Why only Volumne0 marked degraded, but not Volumne1? Suppose the error hard disk also contains data for Volumne1, but its health is now marked as green?




• I've tried to check the hard disk with hddguardian and it seems to be fine




• If I am going to replace the hard disk, but as it also contain the Volumne1 which is Raid0, so the olumne will be also offline when I remove the disk, what would be the best strategy for replacement?