Suggested WD diagnostic program done, and passed. All positive results.
Ran CrystalDiskInfo, screenshot attatched.
Chkdsk gave me these results, but only from an elevated command prompt. (On a regular command prompt, the window would close presumably as soon as it was done, which I don't remember being normal)
Quote:
Usn Journal verification completed.
The master file table's (MFT) BITMAP attribute is incorrect.
The Volume Bitmap is incorrect.
Windows found problems with the file system.
Run CHKDSK with the /F (fix) option to correct these.
I scheduled scan/fix on reboot, which did not seem to fix anything. I also gave it a second try while doing it from the drive properties, no fix.
I wasn't able to use the normal SeaTools, because when I tried to install .net framework in non-safe mode windows would BSOD immediately upon trying to install it. That's the only time I've seen it vary from being around 3 minutes, I tried several times for the same result.
SeaTools for DOS was a success though, and I passed both the short-test and the long-test.