I have 2 bay NAS with a single 1TB disk with by default RAID 0.
I think RAID 0 needs two disks minimum (see here
)so what you've got is, er... a disk, and a faulty one at that.
Was it partitioned, and if so, was your data on a separate patition? in which case you may be able to use the system on your new disk to mount the data partition of the old disk and get the info off that way.
If not, you'll probably not be able to mount the old disk from the new system and you've lost it.
Setting up a RAID over partitions on the same disk serves no function I can think of, no redundancy, no reduction of transfer speed. That's not how your nas set the disk up is it?