Patent ID: 7899974
Filing Date: 2011-03-01
Classification: G06F

Abstract:
1. A nonvolatile memory comprising: a data area in which data is written; and a preliminary area in which block state information is written, wherein the block state information includes a first state about a block F in which no data is written, a second state about of a block M in which sector offsets of the written data coincide with each other, a third state about of a block N in which sector offsets of the written data do not coincide with each other, and a fourth state about of a block O in which the written data is not effective any longer, wherein the block F is converted to the block M or the block N, and then the block M or the block N is converted to the block O, whereby a transition procedure of the block state information from the block F to the block O is performed within two operations.