Sorry for the delayed response ...
The harddisk(1TB Hitachi Harddisk, Partion : MTB) is dispayed as "Unknown Disk" in the device manager.
The 1tb disk is not shown in the Disk manager!
When i connected the same hard disk in another computer it is displayed as only"" in the seta port.
I think the harddisk is gone. Is there any way to check and reformat the drive?
Check the connections to the 1tb drive. It's got to show up in bios before you can use it.