thanks fishears, I think I'm getting on the right track with this AOSP standard now. I'm using the original b35, not the one that six posted.
What folders need to get moved so apps can access them with the AOSP standard? Originally, Rom Toolbox could find my backups, but I could see them in manual recovery. I copied the Clockworkmod folder from emmc to sdcard, and now Rom Toolbox sees them. But I don't know where they should truly be kept -- I suspect that when I make another nandroid (in manual recovery), it'll get put in emmc and Rom Toolbox won't see it. I saw another thing that mentioned copying over sdcard/Android and sdcard/data to emmc. All seems to work fine for now, but I have redundancies everywhere.
I don't really care either what the storages are named, and I'm not all hot to get them back to how Samsung did it. But considering that all future builds/releases will probably sdcard=external, I'd like to switch over whichever folders I need to now.
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