As recently mentioned by Akeo (Rufus author) on reboot.pro here, The new Windows 10 Creators Edition seems to have changed the way it handles Removable USB drives!
Previously, Windows XP/7/8/10 would only mount one partition on a Removable USB drive. However, now it seems to treat a Removable USB drive almost the same as a Fixed-Disk drive and you can assign drive letters to multiple partitions (if they exist) on a Removable USB drive!
This is a big change, so this may well cause problems with all sorts of USB-friendly apps!
Tip: To see what version of Windows you have, use the WINDOWS+R key chord and type WINVER in the Run box...
Previously, Windows XP/7/8/10 would only mount one partition on a Removable USB drive. However, now it seems to treat a Removable USB drive almost the same as a Fixed-Disk drive and you can assign drive letters to multiple partitions (if they exist) on a Removable USB drive!
This is a big change, so this may well cause problems with all sorts of USB-friendly apps!
Tip: To see what version of Windows you have, use the WINDOWS+R key chord and type WINVER in the Run box...