Patent ID: 8503243

Claim:
A method of reading a flash memory device, the method comprising: determining a read voltage set of memory cells corresponding to a first word line from flag cell data of the first word line and flag cell data of a second word line adjacent to the first word line; and reading the memory cells corresponding to the first word line according to the determined read voltage set, wherein determining the read voltage set of the memory cells corresponding to the first word line includes: determining whether the first word line is a finally written word line from at least one of the group consisting of the flag cell data of the first word line and the flag cell data of the second word line; and determining a first read voltage set as the read voltage set of the memory cells corresponding to the first word line, when the first word line is not the finally written word line, and determining a second read voltage set as the read voltage set of the memory cells corresponding to the first word line, when the first word line is the finally written word line.