Preserving data Most basic checksum data size Computation a1 a2 a3 a4 ....aj... an n b=8bit w=64bit CS=n Pros and Contra ●easy to compute o detects erasures and additions o does not detect any corruption cksum block 11/43 S.Ponce-CERNPreserving data 11 / 43 S. Ponce - CERN risks consistency safety c/c cksum block Most basic checksum : data size Computation a1 a2 a3 a4 ... ai ... an n b = 8 bit w = 64 bit CS = n Pros and Contra easy to compute detects erasures and additions does not detect any corruption