My MBWE broke down although the HDD was still OK. Since the HDD is partitioned into a RAID-1 system it is pretty difficult to mount one partition and get the data from it. But it is possible. This is how I did it:
- Remove the HDD from the MyBook casing
- Put it in an Ubuntu computer
- Start 'disk utility'
- Select for '496Gb Filesystem'
- Set label to whatever you like
- Press 'change'
- Now your label should appear under the 'places' menu (a.k.a. in the file explorer)