Partitioning a HD-CELU2

[nobody0816]

   

If I have understood the other threads correctly, the NAS capabilities of my Drivestation are (still?) only available for the one existing FAT32 partition.

So I'd like to do the following: I'd like to shrink the existing partition from 1TB to 500GB and add a second partition that I format with XFS. After that I'd like to be able to access the first partition via ethernet and both of them via USB. 

How can I achieve this? 

Or more precisely: will gparted on a linux machine (to shrink the partition) followed by a fdisk (to add a second partition) and a mkfs.xfs (to format the second partition) work? And which values do I have to use for the fdisk not to overwrite the HDA (assuming that my Drivestation has one)?