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i'M NOT SURE WHAT A SWORD SKILL IS BUT HERE'S THE SWORD ANIMATION FROM THE TWO SPRITES ON PG 13
No, the way flash works is that all the data has to be cleared at the same time, or at least in very large chunks. After that, the entire page is 1s in binary. From then on, you can only write 0's over the 1's and you wouldn't be able to write a 1 over a 0 since the memory is kind of "one way". Think about it like the voltage potential is put high and it is easy to put it low (by writing a 0) but it can't be put high again unless the entire chip is put high.Its really interesting actually. There is a good article on Wikipedia http://en.wikipedia.org/wiki/Flash_memory#Block_erasure