You can remove the HDD and keep it safe. If you need this virtual disk with HDD back you can insert the drives back to the server. Once inserted if virtual disk already exist on the controller it will be detected and virtual disk will be available without any issues. If virtual disk on the controller is already deleted for this virtual disk controller detect these drives as Foreign drives and you can import the foreign configuration to get the virtual disk back with out any issues. I would recommend to backup your data before carrying out any such maintenance tasks.  
Planning to replace HDD with Dell  SSD. On T330 with H330 RAID adapter. If I have any issue what do I need to do to revert back to the present setup with the HDD drive. Would the H330 controller recognise the previous configuration.  Is there a way of backing the present raid configuration. Thanks  Jamil  
Replacing HDD with SSD drives on T330 with H330 raid.