Questions -> FAQ -> extract the hashes from TrueCrypt volumes

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The use of the last 512 byte goes back to the mbr placement on the first in case of a booting partition. Not sure how it is with a non booting partition. It could be the first 512 byte because there's no mbr. You should simply try out. Create such a disk and crack your own disc. It will be either the first or the last 512 byte.