I have a 1tb SSD which I used to use as a backup drive on my Windows 7 Laptop. When I bought a new Mac I switched it to that as storage for Time Machine.
I have also made several folders on it using the Mac.
This morning I took it to the laptop to do a backup there thinking I could just create another folder for Acronis.
The problem is the laptop will not recognise it. What worries me is if it has been formatted by the Mac and cannot be recognised by windows, how do I get it back to normality? should I need it in future.
I have only just got the Mac, so I know very little about them. I suspect that your Hazarded guess is correct.
I don't real need to do anything at the moment, but unless someone comes up with a better theory, I think I will take your advice. I can Partition the Buffalow using Mac then try and format it NTFS using the laptop. The problem is I may have to delete the current partition in which case I would lose all my Mac Time Machine backups.