Second HDD not showing. HELP!

I have been using a Seagate barracuda 2tb for a secondary HDD for storage and all of the sudden it just disappears. This is what happens, I start up my comp and log into windows, my hard drive is showing, then about 2-5 minutes later it disappears, it doesnt even show in disk manager. I don't know what to do, I have so much stuff on that hard drive.
I've tried switching cables and everything, nothing works. Is it possible that my hard drive is broken?
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    Welcome to the TH community, Ryan!

    I'd recommend you try swapping the SATA port where that secondary HDD is connected to as well. If you have access to another computer, I'd suggest you plug the hard drive there, too. If you are able to recognize it for a longer period of time, backup all your data from the drive immediately. Another thing you could try is connecting the drive externally via a SATA-to-USB cable with an AC adapter or a docking station/enclosure. Check if you will be able to access the drive's contents.
    Once you are able to detect it properly, make sure you run the HDD manufacturer's brand-specific diagnostic tool and check up on the health and SMART status.

    Give it a try. Hope it helps! :)
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