The problem occurs even when both machines have been turned off between sessions. A scan subsequent to the 'repair' shows no PHD fault.

Using the desktop PC the PHD reports a file error and asks to repair it, whereupon the four new folders appear together with the original three. When I then attach the PHD to my laptop, it shows the original three folders as being present, with no mention of the new four. This starts similarly by deleting the three existing folders using the desktop (or a quick format) and then copying four new different folders and contents to it. I then copy these folders onto my laptop, close it down and unplug the PHD ready for my next session. Say I quick format the PHD and save three folders to it using my desktop PC. Both machines are anti-virus protected using ESET. Both machines are running Windows 10 and are up to date. Recently I have encountered a problem, which is common to all these drives, regardless of which USB port is used. I have several portable hard drives which I use for transferring files from a desktop PC to my laptop.

Ultracopier portable