* martin f. krafft: >> A corrupt sector corrupts the remaining part of the block. Block >> sizes are much smaller than 1 GB because when part of a block is >> changed, all the following bytes have to be rewritten (if a reasonable >> the cipher mode is used). > > Of course blocks are small, e.g. 64 bytes. These are *cipher* blocks, and they are chained only within a *block device* block.