On the other hand, it carries the advantage of being able to correct bad data (or at least detect it) if it writes bad data and a good checksum, which other fil

On the other hand, it carries the advantage of being able to correct bad data (or at least detect it) if it writes bad data and a good checksum, which other filesystems won't do. Seeing as the data for a check-summed block is much larger than the checksum itself, this seems like a net win as assuming a uniform probability of memory errors for each byte of memory, an error is more likely to occur in the data (though I guess it depends on the specifics of the implementation).