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Try to think of it not in terms of true read-only memory from the earlier days of computing; think of it more as persistent RAM that doesn't require refresh current to retain data -- i.e. it won't 'forget' after a hard reset or when the batteries die. I suspect they call it ROM mostly to differentiate it from the volatile RAM (i.e. 'Main') in the system and in keeping with the traditional scheme of storing the permanent firmware in ROM.
You can install apps or store data in the unused portion of "Built-in Storage". Perhaps future OS upgrades will make use of some of the slack space.
-Bill, Ottawa, ON
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