raid one Confused about a raid one setup

[Hightimes]

How do I get a HDD to be mirrored onto the raid one configuration?

 

Lets call the raid drives, A and B.

 

Now lets say I have another HDD, drive C.

 

How do I get drive C to be mirrored to my raid setup?

 

The reason I ask this question is because, when you setup the raid config, both of the drives you choose will be erased, and for me that defeats the purpose because, I need everything on drive C to be mirrored. And as far as my knowledge goes raid 1 only works with two drives, right? Or am I not understanding it correctly?

[leadeater]

RAID 1 is usually two drives yes, some allow non standard configurations with more than 1 disk in RAID 1 sometimes called RAID 1E.

 

You can when you create an array tell the RAID controller or software to not initialize the disk. Only put a single disk in this array and it will retain it's data, then add another disk to the array and it will mirror all the data to this disk.

 

If you try this backup the source disk first.

[Hightimes]

34 minutes ago, leadeater said:

RAID 1 is usually two drives yes, some allow non standard configurations with more than 1 disk in RAID 1 sometimes called RAID 1E.

 

You can when you create an array tell the RAID controller or software to not initialize the disk. Only put a single disk in this array and it will retain it's data, then add another disk to the array and it will mirror all the data to this disk.

 

If you try this backup the source disk first.

That makes a lot more sense. Thank you, much appreciated!