Windows 10 has a cache issue when saving/reopening files which I can repeat and would appreciate some advice/ideas

Note: I have come here after weeks of problems and series of tests. I have ruled out antivirus, drivers, hardware and a host of other issues raised my Microsoft and can repeat this problem with out fail.

I have had two identical computers (A and B) built for me by a reputable store. Both run Windows 10 with a genuine COA on each system. I use one system at home and one at work. I have a portable drive that contains my data that is shared/used by both systems. I have bought seven drives to date out of shear frustration thinking it was hardware - 2Tb, 3Tb, and 4Tb from Seagate, Toshiba and WD - they all do this:

Note: file type *.xyz is just an example and not a real file type and only to assist this discussion (I have tried many file types as well)

  1. Computer A > Save a file at 4PM onto a portable drive (for example - time stamp 4PM
  2. Computer B > at 6PM commence working on the file and save at 10PM ( - time stamp 10PM
  3. Computer A > at 8AM (next day) go to the portable drive to discover the file ( is time stamped back at 4PM?

Now if I try to the run the file Windows starts giving errors about the file being corrupt or inaccessible.

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Computer B > if you take the portable drive back to Computer A the file is time stamped 10PM and opens and saves as per normal i.e. Computer A will no longer run the file, yet Computer B does from the same portable drive and location.

This problem also appears affects folders if some work is done on these - and seems to be why an entire portable drive becomes inaccessible even though it works fine on the other computer.

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One final note: I can recover the so-called corrupt inaccessible files on Computer A using any recovery utility such as Recuva or similar. And yes, this whole process works vice-versa - files saved at home do the same in reverse!

So, it appears there is a caching issue in Windows 10 with portable drives.

Does anyone know how to overcome this situation?