Apparatus, non-volatile memory storage device and method for detecting drift in non-volatile memory

A non-volatile memory storage device, comprising:

• non-volatile memory storage dies;
• a processing unit managing operations at the non-volatile memory storage device;
• and
• an encoder/decoder unit to:
• determine whether bits to write have more of a first value than a second value, wherein each bit has the first value or the second value;
• flip each of the bits to change any bits having the first value to the second value and change any of the bits having the second value to the first value in response to determining that the bits have more of the first value than the second value;
• indicate whether the bits were flipped or not flipped;
• calculate parity for the bits;
• write the bits and the parity for the bits to a location in at least one of the non-volatile memory storage dies;
• read bits at the location in the non-volatile memory storage dies;
• and
• flip each of the read bits having the first value to the second value and each of the read bits having the second value to the first value in response to indication that the read bits were flipped.

A method for writing and reading data at a non-volatile memory, comprising:

• determining whether bits to write have more of a first value than a second value, wherein each bit has the first value or the second value;
• flipping each of the bits to change any bits having the first value to the second value and change any of the bits having the second value to the first value in response to determining that the bits have more of the first value than the second value;
• indicating whether the bits were flipped or not flipped;
• calculating parity for the bits;
• writing the bits and the parity for the bits to a location in the non-volatile memory;
• reading bits at the location in the non-volatile memory;
• and
• flipping each of the read bits having the first value to the second value and each of the read bits having the second value to the first value in response to indication that the read bits were flipped.