Data storage device and operating method thereof
A data storage device includes a nonvolatile memory device; a randomizing unit configured to randomize data to be stored in the nonvolatile memory device and derandomize data read from the nonvolatile memory device, by using seed values; and a control unit configured to, in the case where return is made from a power failure state to a normal state, detect a page of the nonvolatile memory device in which a power problem has occurred, and randomize data of the page in which the power problem has occurred, by using a seed value that is different from a seed value corresponding to the page in which the power problem has occurred, through the randomizing unit.
1. A data storage device comprising:
a nonvolatile memory device;
a randomizing unit suitable for randomizing data to be stored in a page of the nonvolatile memory device and derandomizing data read from the page of the nonvolatile memory device, with a seed value; and
a control unit suitable for, in the case where return is made from a power failure state to a normal state, detecting a program-interrupted page of the nonvolatile memory device in which a power problem has occurred, and controlling the randomizing unit to re-randomize data of the program-interrupted page with a second seed value that is different from a first seed value corresponding to the program-interrupted page.
2. The data storage device according to claim 1 , wherein the control unit stores the re-randomized data in an empty page, and invalidates the re-randomized data.
3. The data storage device according to claim 1 , wherein the control unit controls the randomizing unit to derandomize the re-randomized data with the first seed value.
4. The data storage device according to claim 1 , wherein, in the case where return is made from the power failure state to the normal state, the control unit detects a program-completed page of the nonvolatile memory device in which a power problem has not occurred, and re-randomizes data of the program-completed page with a first seed value corresponding to the program-completed page.
5. The data storage device according to claim 4 , wherein the control unit stores the data re-randomized with the first seed value corresponding to the program-completed page in an empty page, and validates the re-randomized data.
6. The data storage device according to claim 5 , wherein the control unit controls the randomizing unit to derandomize the re-randomized data with the first seed value corresponding to the program-completed page.
7. The data storage device according to claim 1 , wherein the control unit detects a page for which a program operation is interrupted as the program-interrupted page.
8. The data storage device according to claim 7 , wherein the control unit detects a page before an erased page in a program sequence as the program-interrupted page.
9. A method for operating a data storage device including a nonvolatile memory device, the method comprising:
detecting a program-interrupted page in which a power problem has occurred, in the case where return is made from a power failure state to a normal state;
recovering data of a program-completed page for which an operation was completed before the power problem has occurred; and
destroying data of the program-interrupted page,
wherein the destroying comprises re-randomizing data of the program-interrupted page with a second seed value that is different from a first seed value corresponding to the program-interrupted page.
10. The method according to claim 9 , further comprising:
storing the re-randomized data of the program-interrupted page in an empty page; and
invalidating the re-randomized data of the program-interrupted page.
11. The method according to claim 9 , further comprising:
derandomizing the re-randomized data of the program-interrupted page with the first seed value corresponding to the program-interrupted page.
12. The method according to claim 9 , wherein the recovering comprises re-randomizing the data of the program-completed page with a first seed value corresponding to the program-completed page.
13. The method according to claim 12 , further comprising:
storing the re-randomized data of the program-completed page in an empty page; and
validating the re-randomized data of the program-completed page.
14. The method according to claim 12 , further comprising:
derandomizing the re-randomized data of the program-completed page with the first seed value corresponding to the program-completed page.
15. The method according to claim 9 , wherein the detecting comprises detecting a page before an erased page in a program sequence as the program-interrupted page.