I have several external hard disks that give me a warning when I connect them to my PC or laptop. Both are recently updated to Windows 10 (version 20H2). The warning message tells me that I have to scan my disk using chkdsk. When I do so, no errors are found and the disk seems to function like normal. However, when I later connect the same disk to another machine (which is still running on W10 version 1909) I get the same warning: I need to scan the disk. Again, no error is found, same story... After that, when I connect the disk back to the PC with the latest upfate (20H2), same warning etc. etc. When I use the disk on only one machine, there are no further warnings, but as soon as I connect it to a machine with the other version of Windows 10, the warning show up again. This happened to me earlier when I tried version 2004 (april update) and that was one of the reasons that I decided to skip that one. So far, there has not been any major damage done, but this can't be a good thing. I've read some stories about problems with "Windows Storage Spaces" where Microsoft specifically warned about using chkdsk in case of an error occuring. So I guess this can be related to that problem, but I'm not sure. Did anyone encounter the same problem using an external USB drive? Since it happened on 2 machines, I do not think that I'm the only one.