Preserving data Checksum Definition "small-size datum from a block of digital data for the purpose of detecting errors" n blocks W 6 a1 a2 a3 a4 ..ai. an → CS cksum block 10/43 S.Ponce-CERNPreserving data 10 / 43 S. Ponce - CERN risks consistency safety c/c cksum block Checksum Definition “small-size datum from a block of digital data for the purpose of detecting errors“ a1 a2 a3 a4 ... ai ... an CS n blocks b w