Welcome to the TH community, prabhdialsunny!
Did you unplug all other hard drives from the system when you were installing Windows onto the SSD? It's possible that if you had all the other drives connecting to the motherboard at the time of the OS installation, you are now encountering an OS confusion that doesn't allow you to see or access all your connected HDDs. My recommendation would be to repeat the OS installation onto the SSD, but make sure you have all other HDDs unplugged from the SATA ports. If that doesn't help either, you should try
Resetting BIOS and see if that will help you somehow. Keep in mind, though, that the reset will get your BIOS settings back to factory defaults. This would require you to reconfigure any settings you've tempered with.
Let me know how it goes!
Good luck!
SuperSoph_WD