iPhone uses a different filesystem so of course it wouldn't normally mount to any other OS.
Anyway, if anyone is looking for a multi-OS utility is to do this, there's iFunBox.
The rationale behind it (even for unjailbroken iPhones, iPods, and iPads) is that it allows you to directly access the Documents folders of apps and back up your own game save files, documents, databases, downloaded data, etc... manually. That's best in case you want to wipe your device clean and don't want to restore from a backup made by iTunes.
On a jailbroken device, iFunBox can access any folder. On a vanilla device, it can only write to the Documents folder inside each app.