Patent ID: 9672919
Date: 2017-06-06
CPC Classifications: G06F,G11C

Claim:
1. A method, comprising: in a memory comprising a plurality of memory cells, storing first data in a group of the plurality of memory cells using a first type of storage command, wherein the first type of storage command programs a first subset of the memory cells in the group to a first programming level and programs a second subset of the memory cells in the group to a second programming level; storing second data in the memory cells in the group, in addition to the first data, using a second type of storage command, wherein the second type of storage command programs a portion of the first subset to a third programming level and programs a portion of the second subset to a fourth programming level; reading the first data in the group using a first read threshold voltage; upon detecting imminent interruption of electrical power to the memory during storage of the second data, switching to perform an alternative storage operation, wherein the alternative storage operation ceases programming the first subset and programs the second subset to a fifth programming level, different than the fourth programming level; and reading the first data in the group using a second read threshold voltage, greater than the first read threshold voltage, after the interruption of electrical power occurs.