Question Storage Drive not showing up in Windows.

Jul 28, 2019
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I've seen possibly 10-20 posts about this, none of them have my solution.

My C: (128 gb) drive which holds all my files for Windows and my documents is untouched, appears in BIOS and appears in Disk Management/Device Management.

My D: (1 tb) drive, which holds my games, and other huge files shows up in BIOS, but not anywhere else (device management, Disk management, etc.)
Please, do not tell me to simply add a partition or initialize it. Seems to be a common trend on these posts where people don't read it and just say to do that. I can't as it does not show up in Disk Management.

The events leading up to this are as follows:
3 days ago, turn of my computer. Nothing prior to this has had anything go wrong with my drives.
2 days ago, my D: drive does not appear when I turn my computer on. What do I do? Turn off my computer by using the button of the chassis to enable a hard reset. Works perfect. Use it for 3-4 hours before turning it off and going away. Turn it back on 2 hours later, no problems at all.
Yesterday, again, no problems!
Today, I turned my computer on, and it was fine. But about 3 hours into use, I noticed that one of my games running in the background (Garry's Mod on Steam) had shutdown immediately, which is stored in the D: drive, with no warning. Wanting to check crash logs, I tried to open up the D: drive and it was gone. BIOS still recognized it though.

I tried switching around SATA cables, looked at this forum for 2 hours and did all the solutions, nothing happened. Still not responding.

Specs:
GTX 1660 Graphics Card
AMD Phenom(tm) II X4 925 Processor
Motherboard (not sure specific build because pretty old, but manufacturer): FOXCONN
2x8 Corsair 16GB (forget specific model, pretty sure its the Vengeance line)
Power: EVGA 650 Watt (plenty more than need by 100 watts)

Yes, I have checked in another computer and the drive works fine. SATA cables are also not the problem, as swapping them around changes nothing.
 
Examine the SMART report on the other computer. Look for reallocated, pending or uncorrectable sectors.
Edit: I realized that although the other computer recognized the drive, it could not put things in it or withdraw anything. It can’t read it I guess.

Whenever I attempt a SMART test in the BIOS (whether it be the short or long one) it completes about 13% through, then gives me the message, “Self Test Status Value: 7 (Completed with the read element of the test failed)”

I figure this means it can’t read the hard drive, correct?
 
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Drives sometimes go offline if they remain busy for too long. Usually the reason is that they are performing error recovery and the OS times out during this time. I would clone the drive, if possible, with HDDSuperClone or ddrescue. These tools understand how to deal with bad sectors, and they keep a log so that the process can resume after an interruption.