Use secondary drive after owncloud is up and running?

Hello,

I deployed my owncloud instance on a VM within the Windows Azure cloud, by means of the BitNami VHD provided there (Thank you!).

My problem is that the drive was only 30 GB in size. For that, I would like to add a secondary drive about 1TB in size to the VM in question (one can do that easily), but how do I enable BitNami OwnCloud to use it, post-install?

Thanks, Robin