I am sure this will seem like an ignorant & impertinent question. Sorry.
I'm just wondering how to get past Razr Maxx 8Gb fixed-size int storage, to utilize a ROM slot. Surprised this isn't FAQ. /sdcard/ partition is always 8Gb, always ~0 available. Thus I cannot establish a slot. Others have installed CyanogenMOD on XT912/spyder. That ROM doesn't install in stock, only in slot1. How's it achieved?
I've removed apps from internal to actual SD, and available internal remains effectively at zero. File Explorer reports several gigs available on Moto's other internal partition (media) but provides no means of migrating apps to it, in order to make space available on the HFS primary. 'Phone' & 'External' are only options for apps to live. Apps which can run from external, when moved there, still free up no space.