Patent ID: 11960397
Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 17:
18. A data storage device, comprising:
memory means; and
a controller coupled to the memory means, wherein the controller is configured to:
maintain a first mapping portion and a second mapping portion, wherein:
the first mapping portion includes a first number of first bits and a second number of second bits;
the second mapping portion includes a third number of first bits and a fourth number of second bits;
a bit of the second number of second bits is flipped when the first mapping portion is updated; and
a bit of the fourth number of second bits is flipped when the second mapping portion is updated;

determine if the second bits of the first mapping portion matches the second bits of the second mapping portion; and
restore the first mapping portion and the second mapping portion from the memory means when the second bits of the first mapping portion is different from the second bits of the second mapping portion.