Question Why my HDD is not showing?

Aug 4, 2020
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Actually when I open my PC, both drives I mean SSD and HDD are shown. after 10 to 15 minutes only SSD is showing.
My HDD is disappeared from anywhere like My Computer, Disk Management and Device Manager.
I have all screenshots, I can share it with you guys.
What should I do?
You may recommend me any YouTube tutorial regarding this issue.
 
Aug 4, 2020
11
0
10
And HDD is showing in BIOS.
But Device Manager, Drive Management and My Computer is not showing HDD.

If I shut down my PC and start it after some hours. Both SSD and HDD will be shown. but after sometime 10 to 15 minutes only my SSD will be shown and HDD will be disappeared from anywhere.