Answer by roguekiller23231 · Jan 05, 2012 at 12:36 AM
Yes it's perfectly safe to defrag 2 drives, even at the same time (as long as your not defraging 2 partitions on the same drive).
I usually defrag all 4 of my drives at the same time with o&o defrag and never had a problem.
Answer by timonline · Mar 17, 2013 at 01:29 AM
Yes it is completely safe to defrag your RAID 0 partition (which I understand has two drives in them).
What RAID 0 does is just split your data down the middle thus putting odd blocks on one drive while putting the even ones on the other drive)
The operating system and by extension the defragmentting tool will not care or be hindered by the fact the partition is on two disks, it will just check the blocks in sequence regardless of where they physically are.
A while back I created a video tutorial on creating a striped partition and explain briefly how it works and why you would want to create such a partition. The link to the video is here
Answer by Compucore · Mar 17, 2013 at 01:51 PM
Personally. I would rather defrag on raid1 personally I have a old netserver LPR running on raid 1 with two disk of the same size. if one should go down it can recover it and reimage the second disk like while using the other. It may take a little time to restore the second disk if it should fail. and depending on the size of the drives in question. At least your not going to lose and data that way.