Just tested and this does not work currently with NTFS formatted devices.
We currently build against libfat only. To support NTFS formatted devices for game storage, we would need to link against libntfs as well and add some code to support these as external USB devices. This should be relatively simple as the API is similar to libfat: https://code.google.com/p/libntfs-wii/
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This issue may be fixed by the recent update of the devkitPPC SDK:
https://github.com/scummvm/scummvm/pull/413
Anonymous: Please try either the development (v1.7.0git) or stable (v1.6.0git) nightly builds from here and see if this works:
http://buildbot.scummvm.org/snapshots/master/wii-master-latest.tar.xz
http://buildbot.scummvm.org/snapshots/stable/wii-stable-latest.tar.xz
Changing to pending user feedback.
Just tested and this does not work currently with NTFS formatted devices.
We currently build against libfat only. To support NTFS formatted devices for game storage, we would need to link against libntfs as well and add some code to support these as external USB devices. This should be relatively simple as the API is similar to libfat:
https://code.google.com/p/libntfs-wii/
If we do this, we probably should add support for ext2/3 as well via:
https://code.google.com/p/libext2fs-wii/
This again has the same API and that would cover the three main likely partition formats for external USB mass storage.