[prirun]

There is still a race condition: if you read data from disk into a buffer, make a copy of the buffer, then do 2 checksums, the bit flip can still occur before the 2nd copy is created.

[Dylan16807]

Are you worried that the data is corrupted on disk but a random bit flip makes it look right?

Otherwise a bit flip that early during read shouldn't matter because you're checking it against the disk checksum.

If you don't have disk checksums then ECC memory is not where you should be putting effort to keep things safe.