My Book Mirror Edition 2 TB Black question about RAID

I have this disk that i used to back up my 1 TB disk containing audio files.

Now that i’ve upgraded this audio disk to 2 TB, i want to be able to take backup to the Mirror edition disk, but the size of the disk is 1 TB.

What must i do to format it to 2 TB?

I have a Mac, Snow Leopard.

Thanks in advance!

The My Book Mirror is problably in Raid 1 mirror, that could be the reason why you are not able to see the complete capacity. You need to change the Raid setting using the WD Raid Manager to see the full 2 TB capacity.