How to attch the new local HDD to XenServer  
use following command to add additional storage repositories  
xe sr-create name-label="Local storage 1" shared=false device-config-device=/dev/sdb type=lvm 
(change /dev/sdb to your new partitions/disks (hdb1, sda1 sdb1)  
additional infos for remove:  
xe pbd-list  
xe pbd-unplug uuid=93507256-3d27-1a88-069d-99ae42e22c0b  
xe sr-forget uuid=8732a849-a6dc-ec01-2689-cdb9d44dbe14  
or  
xe sr-destroy uuid=8732a849-a6dc-ec01-2689-cdb9d44dbe14