[SOLVED] Must all drives be in RAID?

[auzzle]

I was wondering If all drives in a PC had to be in a raid configuration, or if you could have say your OS on an SSD and then have to HDD's in a RAID 1.

 

[Barty1884]

No, not all drives need to be in RAID. Your proposal (OS on SSD and HDDs in RAID) is certainly possible.

Now, the question is why you'd want to do so?
RAID is not an adequate backup solution and, by the time you account for overhead, there's not much speed benefit to be gained from secondary/storage drives.

 

[R_1]

if you are using windows 10 look into storage spaces. we used to call them drive pools, drives are thrown together and depending on your need the folders within can be stored on one drive or both drives for initial redundancy.
https://support.microsoft.com/en-us/help/12438/windows-10-storage-spaces
redundancy in drives or folders is no solution to a proper backup routine.