Not stayed with created partition

hi,

   i am seeking for help regarding the issue which i am facing !

i have dismount the hard drive from its case due to the failuare of power supply i thought to connect it directly to Desktop pc as a internal hard drive but when i partitioned the HDD 1TB drive to after restarting it does`nt stable in the partition state which i had created before restarting. it shows in device manager as a unknown & unpartitioned device HDD.

does any one know about this is ???

:cry: HELP ME :cry: