Host command based read disturb methodology
View Patent ↗An apparatus comprising a memory and a controller. The memory may be configured to process a plurality of read/write operations. The memory comprises a plurality of memory modules each having a size less than a total size of the memory. The controller is configured to (i) determine if a read disturb has occurred, and (ii) if the read disturb has occurred, the controller (a) determines a size of the group of read/write operations, and (b) writes all of the group of read/write operations to one of the memory modules.
1. An apparatus comprising:
a memory configured to process a plurality of read/write operations, the memory comprising a plurality of memory modules each having a size less than a total size of the memory; and
a controller configured to (i) determine if a read disturb has occurred, and (ii) if the read disturb has occurred, the controller (a) determines a size of a group of read/write operations, and (b) writes all of the group of read/write operations to one of the memory modules.
2. The apparatus according to claim 1 , wherein the controller determines the size of the group of the read/write operations by determining a head pointer and a tail pointer of the group of the read/write operations.
3. The apparatus according to claim 1 , wherein the controller determines a difference between (a) the size of the group of read/write operations and (b) the size of each of the memory modules.
4. The apparatus according to claim 3 , wherein the controller (a) determines if the difference is below a predetermined value and (b) writes all of the group of read/write operations to one of the memory modules.
5. The apparatus according to claim 1 , wherein the controller overrides a wear leveling protocol.
6. The apparatus according to claim 1 , wherein the apparatus comprises a solid state drive (SSD).
7. A method for implementing a read disturb routine in a solid state drive (SSD) comprising a plurality of memory modules, comprising the steps of:
(A) determining if a read disturb has occurred;
(B) if the read disturb has not occurred, using unmodified read commands;
(C) if the read disturb has occurred, determining a size of a group of read/write operations; and
(D) if the read disturb has occurred, writing all of the group of read/write operations to one of the memory modules.
8. The method according to claim 7 , wherein the size of the group of the read/write operations is determined by determining a head pointer and a tail pointer of the group of the read/write operations.
9. The method according to claim 8 , wherein step (D) writes all of the read/write operations to one of the memory modules if the size of the memory module is greater than a size of the group of read/write operations.
10. An apparatus for implementing a read disturb routine in a solid state drive (SSD) comprising a plurality of memory modules, comprising:
means for determining if a read disturb has occurred;
means for using unmodified read commands if the read disturb has not occurred;
means for determining a size of a group of read/write operations if the read disturb has occurred; and
means for writing all of the group of read/write operations to one of the memory modules if the read disturb has occurred.