Ok, I've decided to remove the failing drive and keep the NAS running with a single drive with external back up.

So, I want to move from: '2 disks, Raid 1' to '1 disk, Raid 0'

Can anyone advise on process to achieve this? I've had a look online, but can't see where someone has gone from two to one drive, all examples I see are for replacing and maintaining the number of drives.

This is a short / medium term option as I consider the cost benefit of purchasing a new DS 220 when released in NZ.

If theres no links on going from 2 to one drive maybe it's something that is unusual. I wouldn't want to to something unsual to my nas.

For me I'd just spend the cash and buy new drive and replace the failing one.