don't know what to tell ya bout ds titles, but i suggest using the nintendont forwarder and having all games on the sd card or a usb drive (not the wii u one). you can only have 292 titles installed on the wii u, but you can have unlimited on the virtual wii with things like usb loader gx and nintendont..
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on second thought, loadiine may be the best for ds titles, because you can have unlimited there I think. it shouldn't take too long to load them, since there are fewer files. that's what a lot of hoarders do with vc titles: either use the virtual wii or loadiine. there's also a forwarder for loadiine somewhere.