They mean that single bit errors are detected in storage systems like ecc memory, or ZFS, and will raise a fault (I.e. be detected). Checksums tend not to foll

They mean that single bit errors are detected in storage systems like ecc memory, or ZFS, and will raise a fault (I.e. be detected). Checksums tend not to follow data into the code. So bit flips in the cpu could do anything at runtime: wrong addition, choosing the wrong branch of an “if” block, etc.