Disk utility & adding to existing RAID 0 set

Hi all,
I have a RAID 0 set-up with two 1TB drives, it works just great for what I need, but I am running out of space. And I thought 2TB would be more than enough!!!!!
Just a thought, but can I add another 1TB disk into the RAID (same manufacture & model) and increase the size of the raid set without wiping the contents of the existing RAID 0 set?
Not sure is OS X software RAID would add this as data or a parity disk? Destroy my data and rebuild a new RAID 0 with three disks as data or what?
Any help appreciated.

Hi Tim Cox;
No you can't add another disk to a RAID 0 array.
The way raid 0 works is that it breaks up the data into block that are then written in turn to each of the drives in the array. You can think of this a little like dealing cards when playing a poker. So your data is now spread across two drives. There is no way to spread it across another one so you are not able to add the additional drive.
In order to add the new drive all of the drives would have to be reformatted which will erase all data. So anything currently on the two drive RAID 0 array would have to be backed up first.
What are you currently using for backup?
If either of the two drives were to fall right now you would lose everything. So when using RAID 0 backup is extremely important to protect your data from loose.
Allan

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