Methods and systems for improving terabytes written (tbw) of a nand based storage device

A block reallocating system for improving Terabytes Written (TBW) of a NAND based storage device, the block reallocating system comprising:

• a processor;
• and
• a memory communicatively coupled to the processor and configured to store instructions,
• wherein, upon execution of the instructions, the processor is configured to:
• monitor a Greatest Erase Count (GEC) of each of a plurality of independent block pools in a NAND based storage device at intervals;
• determine a candidate independent block pool among the plurality of independent block pools having a rate of increase of Erase Count (EC) higher than a rate of increase of EC of remaining ones of the plurality of independent block pools, based on the GEC of each of the plurality of independent block pools;
• determine whether the GEC of the candidate independent block pool and the GEC of at least one independent block pool among the remaining ones of the plurality of independent block pools meet a reallocation condition;
• and
• reallocate one or more free blocks from the at least one independent block pool to the candidate independent block pool when the candidate independent block pool and the at least one independent block pool meet the reallocation condition.

A method of increasing Terabytes Written (TBW) capability of a NAND based storage device, comprising the following performed by a memory block reallocating system:

• monitoring a Greatest Erase Count (GEC) of each of a plurality of independent block pools in a NAND based storage device at intervals;
• determining a candidate independent block pool among the plurality of independent block pools having a rate of increase of Erase Count (EC) higher than a rate of increase of EC of remaining ones of the plurality of independent block pools, based on the GEC of each of the plurality of independent block pools;
• determining whether the GEC of the candidate independent block pool and the GEC of at least one independent block pool among the remaining ones of the plurality of independent block pools meet a reallocation condition;
• and
• reallocating one or more free blocks from the at least one independent block pool to the candidate independent block pool when the candidate independent block pool and the at least one independent block pool meet the reallocation condition, said reallocating including selecting one of the remaining ones of the plurality of independent block pools having a lowest GEC for the reallocation when two or more of the remaining ones of the plurality of independent block pools meet the reallocation condition,
• wherein the intervals are set based on when the GEC of one or more of the plurality of independent block pools reaches a threshold percentage of a total MAX_EC pre-configured for the one or more of the plurality of independent block pools.