Different RAID configuration?

Hi,

I've decided to purchace the Thermaltake Muse NAS RAID.

I have 2 HDD full of data of 200GB and 250 GB respectively.

Im considering purchasing two additional disks of 750 GB each.

But I dont quite understanding the RAID functionality. Must all the disk have the same RAID configuration?

Is it possible to have the following configuration:

Disk A (750GB) - Raid 1
Disk B (750GB) - Raid 1
Disk C (250GB) - Linear
Disk D (200GB) - Linear

- so that Disk B is a mirror of Disk A, and Disk C and Disk D are just individual storages.

Is it possible?


Thanks

Chris