ZFS silent corruption

I am trying to find answers to some questions on how ZFS works: * does it detect silent corruption via checksums as soon as data is changed (and differs from checksum), automatic in a way (then if there's RAIDZ 1, it would repair by fetching from mirrored disk), OR this works only when accessing corrupted file(during read, and scrubbing of course)? * I am now confused about traditional hardware RAID now - can it detect silent corruption with same certainty as ZFS, and location of corruption as well, and if yes - is it able to do repair as ZFS also? Just need some more precision in explanation on how this works. Thanks.