Vibration-aware data reassignment

• US 8,037,348 B2
• Filed: 12/21/2007
• Issued: 10/11/2011
• Est. Priority Date: 12/21/2007
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Cheok, Steven TianChye, Shen, JinQuan, Wei, Bo, Chen, HuaYuan
• Primary Examiner(s): SCHELL, JOSEPH O
• Application Number:
  US11/962,270
• Publication Number:
  US 20090164843A1
• Time in Patent Office: 1,390 Days
• Field of Search: 369/247.1, 720/651, 714/18, 714/6.2, 714/6.3, 714/6.32, 360/31
• US Class Current: 714/6.3
• CPC Class Codes: G06F 11/1441 Resetting or repowering
• CPC Class Codes: G11B 19/042 due to external shock or vibration
• CPC Class Codes: G11B 20/18 Error detection or correction; Testing , e.g. of drop-outs
• CPC Class Codes: G11B 20/1879 Direct read-after-write methods
• CPC Class Codes: G11B 2020/1281 Servo information
• CPC Class Codes: G11B 2020/1484 Codewords used in servo patterns
• CPC Class Codes: G11B 2220/2516 Hard disks

Abstract

An aspect of the present disclosure relates to implementing a temporary reassignment of data based on a vibration condition. An exemplary method includes implementing a data operation for a portion of data and detecting a data error during the data operation. The method further includes obtaining an indication of a vibration condition associated with a device with which the data operation is performed and implementing a temporary reassignment of the portion of data based on the vibration condition.

Claims

1. A method of performing a data operation, the method comprising:

detecting a data write error associated with a data write operation for a portion of data to one or more target storage locations of a first, target storage medium; and

implementing a delayed data reassignment mode for the portion of data comprising;

verifying the data write error after a time delay and obtaining an indication of a vibration condition associated with the data write error; and

implementing a temporary data reassignment by storing the portion of data to one or more storage locations of a second storage medium based on verification of the data write error and based on a determination that the vibration condition exceeds a threshold duration.

2. The method of claim 1, wherein storing the portion of data to one or more storage locations of the second storage medium includes writing the portion of data to a solid-state memory device.

3. The method of claim 1, wherein the second storage medium is separate from the target storage medium, and wherein obtaining an indication of the vibration condition comprises receiving a signal from a vibration detection component.

4. The method of claim 3, wherein obtaining the indication of the vibration condition includes obtaining a status of a shock sensor and a servo error code associated with the data write operation to the target storage medium.

5. The method of claim 1, wherein the delayed data reassignment mode includes a reassignment process loop comprising:

a) imposing a time delay;

b) determining if the data write error cleared after the time delay by implementing a subsequent data write operation to the one or more target storage locations;

c) receiving a vibration status from a vibration detection component indicative of a vibration condition during the subsequent data write operation;

d) repeating steps a) to c) until a loop exit condition is satisfied.

6. The method of claim 5, wherein the loop exit condition comprises at least one of a total time delay exceeding a threshold, receiving a vibration status that indicates a vibration did not occur during the subsequent data write operation, and determining that the data write error cleared after the time delay.

7. The method of claim 1, wherein implementing the temporary data reassignment comprises:

creating an entry in a reassignment table associated with the second storage medium, wherein the entry maps the one or more target storage locations to the one or more storage locations of the second storage medium.

8. The method of claim 1, wherein implementing the temporary data reassignment comprises:

determining that the vibration condition has terminated; and

in response to the determination, performing an operation to determine whether the one or more target storage locations are considered to contain one or more media defects.

9. The method of claim 8, comprising attempting to rewrite the portion of data to the one or more target storage locations.

10. The method of claim 9, and further comprising:

detecting a data error during the re-write; and

writing the portion of data to one or more spare storage locations associated with the target storage medium based on whether a data error was detected during the re-write.

11. The method of claim 1, wherein implementing the temporary data reassignment comprises reassigning the one or more target storage locations to the one or more data storage locations of the second storage medium for a period of time that is defined at least in part by a determination that the vibration condition has terminated.

12. A method comprising:

detecting a data error associated with a data write operation of a portion of data to one or more sectors of a first, target storage medium;

obtaining a vibration status from a vibration detection component, the vibration status being indicative of a vibration that occurred during the data write operation;

in response to the detected data error, and based on the vibration status, retrying the data write operation;

in response to retrying the data write operation, repeating the steps of detecting a data error associated with the data write operation and obtaining a vibration status; and

implementing a temporary data reassignment comprising storing the portion of data to one or more storage locations of a second storage medium if the steps of obtaining the vibration status indicate a vibration duration that exceeds a threshold duration.

13. The method of claim 12, wherein obtaining a vibration status comprises obtaining a status of a shock sensor and servo error code associated with the data write operation.

14. The method of claim 12, wherein implementing the temporary data reassignment comprises:

determining whether a storage location in a temporary data storage component is available, wherein the temporary data storage component includes a solid-state memory device;

writing the portion of data to the temporary data storage component if a storage location is available; and

creating an entry in a reassignment table associated with the temporary data storage component, wherein the entry includes information that maps the target sector to one or more storage locations in the temporary data storage component.

15. A data storage system comprising:

a first, target storage medium;

a second storage medium that is separate from the target storage medium;

a vibration detection component; and

a controller configured to;

implement a first data write operation of a portion of data to one or more target storage locations of the target storage medium and detect a data error associated with the first data write operation;

based on the detected data error and an indication of a vibration condition that occurred during the data write operation, implement a data reassignment operation that stores the portion of data to one or more data storage locations of the second storage medium; and

after the vibration condition has terminated, perform an operation to determine whether the one or more target storage locations are considered to contain one or more media defects, access the one or more data storage locations of the second storage medium and perform a second data write operation of the portion of data to the one or more target storage locations of the target storage medium, and reassign the one or more target storage locations to one or more spare storage locations if the one or more target storage locations are considered to contain one or more media defects.

16. The system of claim 15, wherein the controller is configured to perform one or more iterations of implementing a retry of the first data write operation to the one or more target storage locations after a time delay and obtaining an indication of a vibration condition associated with the retry, wherein the controller is configured to implement the data reassignment operation if a threshold delay timeout period is reached.

17. The system of claim 15, wherein the controller is configured to allocate the one or more data storage locations of the second storage medium for data storage during a subsequent data reassignment operation for a portion of data associated with a subsequent data write operation to the target storage medium.

18. The system of claim 15, wherein the controller is configured to implement the data reassignment operation to temporarily reassign the one or more target storage locations to the one or more data storage locations of the second storage medium for a period of time that is defined at least in part by a determination that the vibration condition has terminated.

19. The system of claim 15, wherein the first storage medium comprises non-solid-state memory and the second storage medium comprises solid-state memory.