Strange data loss on my external hard drive?

I can't find a logically explanation for this behaviour and I'm not sure if my files are gone forever now or if there is a solution to recover everything.

I lost all changes from last week on my external hard disk(Toshiba 1TB).
7 days it was plugged into a notebook with Windows XP(drive letter is G: ) and after I plugged the drive back to my Windows 8.1 desktop machine(drive letter is F: here), all the changes I did on the drive while it was plugged into the notebook are non-existent(I connected the drive with my notebook again to check if my files show correctly - but no, they don't).
It seems that the architecture of the external hard drive is exactly like it was 7 days ago, when I decided to unplug it from my Windows 8.1 working station to continue the work on my old notebook. Is there anything I can do to recover everything?
I mean - what the heck happened? I did nothing more than plugging the drive back to my Windows 8.1 machine.

I'm not sure if this has any relationship to my problem - probably not, but usually the time and date on my notebook is incorrect - I only set the correct time when I need to browse the web for example, because browsers will refuse to show any content if the date is too far in the past or future.
Reply to hubschrauberpilot.hendrik
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  1. I actually had this problem about a month ago and I dont know why t happen either. I think though when my windows 10 pc saw files that were from another pc or a different one that is older it detected my files as corrupted/dangerous. After I ran my windows defender, it deleted everything I had from old pc. So I dont know if this relates to you but im still confused what happen.
    Reply to keatingscool
  2. I suspect that it has something to do with different drive formatting between Windows 8.1 and Windows XP - I hope we can do something in this case though.
    Reply to hubschrauberpilot.hendrik
  3. hubschrauberpilot.hendrik said:
    I suspect that it has something to do with different drive formatting between Windows 8.1 and Windows XP - I hope we can do something in this case though.


    That could be the case too, ive tried everything to get back any files and I couldnt find a way. I hope you get some luck
    Reply to keatingscool
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