> ECC can detect and correct one or two (or a few more?) bit-flips at a time, but if there's too many it won't notice that something's gone wrong. ECC can norm

> ECC can detect and correct one or two (or a few more?) bit-flips at a time, but if there's too many it won't notice that something's gone wrong. ECC can normally detect and correct a single bit flip, and detect but not correct a double bit flip, in the "line" of bits protected by it. The ECC protection is local, not global; if there are many flipped bits but they are far enough from each other, each "line" will only have a correctable single-bit flip.