Every modern HDD has a group of self-checking processes it uses on itself all the time, called S.M.A.R.T., which stands for Self-Monitoring, Analysis and Reporting Technology. For an explanation, see this:
https://en.wikipedia.org/wiki/S.M.A.R.T.
If you use your WD Data LifeGuard test utilities it has a place to examine and display the S.M.A.R.T. error messages stored on the HDD and you can start to understand which message caused this warning.
Apparently Active SMART did not give you the detailed explanation, so I can't tell you exactly what the problem is. One of the more common ones is SMART Error 05, "Reallocated Sectors Count". In case that happens to be your situation, here's what that means. When a HDD is manufactured about the last operation is a true "Low-Level Format" that you cannot re-do at home. The result of this operation is two-fold: all the of the disk surface is written to so that magnetic signals are on all the tracks to establish Sectors for use in storing data. There are actually a small excess number of Sectors created beyond what's needed for the rated capacity of the HDD. All the Sectors are tested, and any poor ones are marked off never to be used. The vast majority are designated for use right away as the area that provides the rated storage space. The remaining excess ones are held aside in a semi-hidden collection of known-good spare Sectors.
As the HDD is used, one of its background tasks is to check every Sector as it is used and verify its performance. If any is found weak or faulty, the system attempts to recover the data from that Sector and then writes it to one of the good spares, which becomes its permanent replacement. The weak Sector that was detected is added to the list of known-bad one to never use. Each time this happens, the system keeps track of how many Sectors have been Reallocated. Note that this all happens inside the HDD, and normally the OS (Windows or whichever) is completely unaware that this has happened.
At some point, the stock of remaining good spares gets reduced to a trigger level, and the S.M.A.R.T. system creates the type 05 error message. There are utilities (like Data LifeGurad) that can read out the S.M.A.R.T. data, and many BIOS's can be set to check them for you and display warnings as part of the start-up routine. It is up to you to respond to it. This message does NOT say that your HDD has failed. It is possible, although not likely, that in fact one or more Sectors failed so badly that its data could not be recovered and a file is corrupt. It is much more likely that all the data recovery efforts have succeeded, and all the data on your drive is OK. BUT you still need to take action. The message really implies two things: (a) many bad Sectors have been replaced, and this probably indicates that more will occur, possibly more quickly; and, (b) there is only a small stock of known-good Sectors left to continue this automatic-fix process, so the process will fail at some time in the future. The proper action on your part is to buy a new HDD and clone all your data from the failing one to the new one as soon as possible, while the drive is still operating OK and all your data are still uncorrupted.
NOTE that, because this particular process usually succeeds in recovering data and copying it to a replacement good Sector, almost all processes for TESTING your HDD will NOT show an error! All the Sectors in use are good ones, and all the bad ones have already been retired and replaced. That is why your Short and Long tests, and Windows CHKDSK, will not tell you the HDD has failed. It has not. But it probably will in future.
Now, that is only one of the S.M.A.R.T. messages. Many of the others have a similar implication: this is a serious warning of future failure, but for now your data are safe, so replace this drive while you can.
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