> many storage technologies do protect against errors, CD/DVD/HDD all have ECC in the physical layer. but without control/knowledge of the physical medium (so a

> many storage technologies do protect against errors, CD/DVD/HDD all have ECC in the physical layer. but without control/knowledge of the physical medium (so at filesystem level), how do you distribute the ECC sensibly? you can't. SSDs and other flash storage heavily rely on ECC as well.