Thanks for the quick reply guys!
I have got no idea! I just bought it from curries, and plugged into the work Windows laptop and started saving stuff onto it!
As I say, less than five years old, 64GB memory stick from curries. Whatever the bog standard file system would be on those. Sorry, I’ve got no idea!
It’s been so many years, since I’ve actually got into personal home tech, so be interesting to See how I get on with this Mac.
10 years ago, I used to do a bit of UNIX programming, funny how things come around