Temperature variation compensation
A data storage device is configured to mark data for refresh in response to determining that a first measured temperature associated with writing the data to the memory exceeds a first threshold. The data storage device is further configured to refresh the marked data in response to determining that a second measured temperature associated with the memory is below a second threshold.
1. A device comprising:
a flash memory; and
a controller coupled to the flash memory, the controller configured to mark data for refresh in response to determining that a first measured temperature associated with writing the data to the flash memory exceeds a first threshold temperature, the controller further configured to refresh the marked data in response to determining that a second measured temperature associated with the flash memory is below a second threshold temperature, wherein the second threshold temperature is below the first threshold temperature.
2. The device of claim 1 , wherein the controller is configured to mark the data by adding an indication of the data to a marked data list.
3. The device of claim 2 , wherein the controller is configured to access the marked data list and to initiate a data refresh operation in response to detecting that the second measured temperature is below the second threshold temperature.
4. The device of claim 1 , further comprising a temperature sensor configured to indicate the first measured temperature and the second measured temperature to the controller.
5. The device of claim 1 , further comprising a temperature sensor for the flash memory.
6. The device of claim 1 , wherein the controller is configured to mark the data by adding a refresh flag to the data written to the flash memory.
7. The device of claim 1 , wherein the controller is configured to add a write temperature to the data written to the flash memory.
8. The device of claim 1 , wherein the controller is configured to determine a normal historical operating temperature range of the device.
9. The device of claim 8 , further comprising adjusting the first threshold temperature based upon the normal historical operating temperature range.
10. The device of claim 8 , further comprising adjusting the second threshold temperature based upon the normal historical operating temperature range.
11. The device of claim 1 , wherein the refreshed marked data has a lower error rate.
12. A method comprising:
at a data storage device that includes a controller coupled to a non-volatile memory, performing:
marking data stored at the non-volatile memory for refresh in response to determining that a first measured temperature associated with writing the data to the non-volatile memory exceeds a first threshold temperature; and
refreshing the marked data in response to determining that a second measured temperature associated with the non-volatile memory is below a second threshold temperature, wherein the second threshold temperature is below the first threshold temperature.
13. The method of claim 12 , wherein marking the data comprises adding an indication of the data to a marked data list.
14. The method of claim 13 , further comprising, after marking the data:
accessing the marked data list; and
in response to detecting that the second measured temperature is below the second threshold temperature, initiating data refresh operations.
15. The method of claim 12 , wherein the data storage device further comprising a temperature sensor for the non-volatile memory to measure the first measured temperature and to measure the second measured temperature.
16. The method of claim 12 , wherein the data is marked by adding a refresh flag to the data stored at the non-volatile memory.
17. The method of claim 12 , further comprising adding a write temperature to the data stored at the non-volatile memory.
18. The method of claim 12 , further comprising determining a normal historical operating temperature range of the data storage device.
19. The method of claim 18 , further comprising adjusting the first threshold temperature based upon the normal historical operating temperature range.
20. The method of claim 18 , further comprising adjusting the second threshold temperature based upon the normal historical operating temperature range.
21. The method of claim 12 , wherein the refreshed marked data has a lower error rate.