1. A method of erasing non-volatile memory, comprising: erasing a group of non-volatile storage elements; verifying whether said group is erased after said step of erasing; reading said group for an erased state, wherein reading said group includes simultaneously reading each non-volatile storage element of said group for an erased state; and determining that said group is defective if said step of verifying verifies that said group is erased and said step of reading does not read said group as erased.