Methods and apparatus for read disturb detection and handling

A solid state drive (SSD) comprising:

• a non-volatile memory (NVM);
• and
• a controller communicatively coupled to a host device and the NVM,
• wherein the controller is configured to:
• determine an error level of an aggressor page in the NVM;
• determine an error level of a victim page adjacent to the aggressor page within a block of the NVM;
• determine whether the error level of the victim page is greater than a first predetermined threshold;
• compare the error level of the aggressor page to the error level of the victim page when the error level of the victim is greater than the first predetermined threshold;
• and
• move at least one of the aggressor page and the victim page when the comparison of the error levels of the aggressor and victim pages indicates that victim level error is greater than the first error level by a predefined factor.

A memory device for use with a non-volatile memory (NVM), the apparatus comprising:

• means for determining whether a number of read accesses of a page in the NVM has reached a predefined value;
• means for obtaining an error measure for the page after the number of read accesses has reached the predefined value;
• means for obtaining an error measure for at least one neighboring page that is on an adjacent wordline to the page within the NVM;
• means for determining if the error measure of the at least one neighboring page is greater than a predefined threshold;
• means for relocating the page and the at least one neighboring page when the error measure of the at least one neighboring page is determined to be greater than the error measure of the page by a predefined factor.