Data always been unmanly precise, and a movie is just that - a movie. They could make up a story about how Data knew how to protect himself from the accident, which turned out fine as he predicted and only his head need to be kept intact for him to be "resurected". All the rest is only robot parts they managed to build and repair fine themselves along the years, only the positronic brain actually is a problem to rebuild. And as said before, all the memories of Data been transfered to B4 just before his last mission. In fact, Data himself was posing as B4, and that's how he infiltrated the alien ship. :P
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