Data Storage Device With Weak Bits Handling

A data storage device, comprising:

• a memory device;
• and
• a controller coupled to the memory device, wherein the controller is configured to:
• receive a write command for a wordline of the memory device;
• read a previously programmed wordline of the memory device, wherein the previously programmed wordline is adjacent to the wordline;
• store the read previously programmed wordline in a first buffer;
• execute the write command for the wordline;
• during the executing, re-read the previously programmed wordline;
• store the re-read previously programmed wordline in a second buffer;
• determine that one or more bits of the stored read previously programmed wordline are different than the stored re-read previously programmed wordline;
• mark the one or more bits of the previously programmed wordline that are different based on the determining;
• and
• store a location corresponding to the marked one or more bits of the previously programmed wordline that are different in a volatile memory device of the data storage device.

A data storage device, comprising:

• non-volatile memory means;
• volatile memory means;
• and
• a controller coupled to the non-volatile memory means and the volatile memory means, wherein the controller comprises a flash state machine, and wherein the flash state machine is configured to:
• receive a write command to write second data to a second wordline, wherein the second wordline is sequential and adjacent to a first wordline;
• read first data of the first wordline for a first time;
• program the second write data to the second wordline;
• read the first data of the first wordline for a second time;
• compare the first data read for the first time to the first data read for the second time;
• mark one or more bits of the first wordline that are different based on the comparing;
• and
• store location information of the marked one or more bits in volatile memory means.