A few more comments.
I finally found ot that the ESET Smart Security firewall was blockingthe communication from the camera and the NVR to the Windows 7 PC. When I unblocked the camera and the NVR in the ESET and having shared a directory in the Windows 7 PC with Read/Write rights for everyone, then I could create a NetHDD havig specified at the NAS section of the camera SMB protocol, the IP address of the PC and /<theShareName> at the PC. Finally I formatted the NetHDD at the storage tab of the camera. Now the camera can record (in any mode, continuous, motion etc) and send timing snapshots at the PC. All this independently of how the NVR has been configured for the specific camera.
Unfortunately, the bove does not work for the NVR. It seems that the NVR does not support SMB shares. It ony support NFS shares. Therefore I installed the haneWin NFS server 1.2.18 and created the NFS shares at the windos PC. Now the NVR can search and find these NFS shares at the specified IP. However the formatting of the created NetHDD does not complete and finishes wit an error. This error in conjuction with the weird reply from the command that alastair suggested in theprevious post, leads me to the conclusion that either there is a bug in the 3.0.9 version of the firmware, OR my firmware installation/configuration is partly corrupted/incomplete.
So the question is: Has anyone succesfully configured, formatted and used the NetHDD feature with a Windows 7 shared directory? If someone is succesfull, Please provide details of firmwre versions and H/W models.