Method of performing wear management in non-volatile memory devices

A method of performing wear management in a read operation of a flash-type memory device which includes a plurality of blocks each having a plurality of pages, the method comprising:

• reading data from a first page in a first block of the flash-type memory device in response to a read command;
• moving data stored in the first block to a second block of the flash-type memory device when the first page meets an early move threshold, wherein the second block is erased and programmable;
• acquiring a first error count associated with an amount of error bits generated in a second page of the second block during a first read which occurs after moving the data stored in the first block to the second block;
• retrieving a second error count associated with an amount of error bits generated in the second page of the second block during a second read, wherein the second read occurs earlier than the first read;
• determining if a difference between the first error count and the second error count exceeds a predetermined value;
• setting an early retirement threshold to a first value when the difference between the first error count and the second error count does not exceed the predetermined value or to a second value when the difference between the first error count and the second error count exceeds the predetermined value;
• and
• marking the second block as the bad block when the first error count exceeds the early retirement threshold.

A method of performing wear management in a write operation of a flash-type memory device which includes a plurality of blocks each having a plurality of pages, the method comprising:

• writing data into a specific page in a specific block of the flash-type memory device in response to a write command, wherein the specific block is erased and programmable;
• acquiring a first error count associated with an amount of error bits generated in a specific page of the specific block during a first write which occurs after writing the data into the specific page;
• retrieving a second error count associated with an amount of error bits generated in the specific page of the specific block during a second write, wherein the second write occurs earlier than the first write;
• determine if a difference between the first error count and the second error count exceeds a predetermined value;
• setting an early retirement threshold to a first value when the difference between the first error count and the second error count does not exceed the predetermined value or to a second value when the difference between the first error count and the second error count exceeds the predetermined value;
• and
• marking the specific block as the bad block when the first error count exceeds the early retirement threshold.