ZFS problem: cannot create 'example': no such pool or dataset

[caesius]

I'm experimenting and learning about ZFS on an old laptop. I am going through the handbook ZFS section. I have started ZFS.

To create a simple, non-redundant ZFS pool using a single disk device, use the zpool command:

# zpool create example /dev/da0

When I try this:

# zpool create example /dev/ad0
cannot create 'example': no such pool or dataset

What's going wrong?

 

[jem]

Is your ad0 device currently unused, or do you have other filesystems currently mounted on it? If you have FreeBSD installed and running already, I suspect your ad0 disk is already full of mounted filesystems.