Re:Once thought safe, DDR4 memory shown to be vulnerable to ...
by cesarb on Friday March 18, 2016 @07:48AM
(#11311112)
> 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.
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.