Adaptive read disturb reclaim policy

1. A memory system, comprising:

a memory including a plurality of memory blocks; and

a controller suitable for:

incrementing a first counter corresponding to a block of the plurality of blocks when the block is read;

incrementing a second counter when the first counter reaches a predefined count number;

determining an error count of the block when the second counter is incremented; and

initiating a reclaim function when the error count exceeds an error threshold, wherein the reclaiming function reclaims valid data in the block when an average error increase per period is larger than a calculated number of errors that the memory system can tolerate.

2. The memory system of claim 1 , wherein the error threshold is based on a difference between an error correction code (ECC) correction capability of the memory system and a total number of errors accumulated in the block.

3. The memory system of claim 1 , wherein the controller is further suitable for calculating a number of errors the memory system can tolerate when the error count does not exceed the error threshold.

4. The memory system of claim 1 , wherein the controller is further suitable for selecting a neighbor wordline to read when the first counter reaches the predefined count number.

5. The memory system of claim 1 , wherein the predefined count number is set to about 10,000 reads.

6. A method, comprising:

incrementing a first counter corresponding to a block of a plurality of blocks of a memory when the block is read;

incrementing a second counter when the first counter reaches a predefined count number;

determining an error count of the block when the second counter is incremented; and

initiating a reclaim function when the error count exceeds an error threshold, wherein the reclaiming function reclaims valid data in the block when an average error increase per period is larger than a calculated number of errors that the memory system can tolerate.

7. The method of claim 6 , wherein the error threshold is based on a difference between an error correction code (ECC) correction capability of the memory system and a total number of errors accumulated in the block.

8. The method of claim 6 , further comprising calculating a number of errors the memory system can tolerate when the error count does not exceed the error threshold.

9. The method of claim 6 , further comprising selecting a neighbor wordline to read when the first counter reaches the predefined count number.

10. The method of claim 6 , wherein the predefined count number is set to about 10,000 reads.

11. A memory device, comprising:

a memory including a plurality of memory blocks;

a first counter;

a second counter; and

a controller configured to:

increment the first counter corresponding to a block of the plurality of blocks when the block is read;

increment the second counter when the first counter reaches a predefined count number;

determine an error count of the block when the second counter is incremented; and

initiate a reclaim function when the error count exceeds an error threshold, wherein the reclaiming function reclaims valid data in the block when an average error increase per period is larger than a calculated number of errors that the memory system can tolerate.

12. The memory device of claim 11 , wherein the error threshold is based on a difference between an error correction code (ECC) correction capability of the memory system and a total number of errors accumulated in the block.

13. The memory device of claim 11 , wherein the controller is further configured to calculate a number of errors the memory system can tolerate when the error count does not exceed the error threshold.

14. The memory device of claim 11 , wherein the controller is further configured to select a neighbor wordline to read when the first counter reaches the predefined count number.

15. The memory device of claim 11 , wherein the predefined count number is set to about 10,000 reads.