Internal HDD

My HDD wont appear in my computer, and then I check disk partittion it's size became 3.68 GB. But it have 500GB size. It is SATA.
 
How did you check disk partition size if it isn't appearing? Whats keeping you from just deleting the partition and trying to create a new one? Have you ran a HDD diagnostic utility on it? Basically need more information for a proper reply.
 
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