Data Storage Device and Method for Read Disturb Mitigation During Low-Power Modes
AssigneeWestern Digital Technologies, Inc.
InventorsPawan Kumar Negi, Meer Afroz Mohammed, Bhavadip Bipinbhai Solanki
Life of this patent
Estimating the term…
Abstract
A data storage device can check data integrity on a wordline in memory each time the data storage device exits a low-power mode. Frequent exits from the low-power mode result in the wordline being read many times, which can result in a read disturb problem. To mitigate this problem, in one embodiment disclosed herein, a different wordline is used to check data integrity each time of a plurality of times that the data storage device exits a low-power mode. Using different wordlines for the data integrity check can reduce the likelihood of a read disturb error. Other embodiments are disclosed.
Claims20
A data storage device comprising:
- a memory;
- and
- one or more processors, individually or in combination, configured to:
- receive a command from a host to exit a low-power mode;
- and
- in response to receiving the command from the host to exit the low-power mode:
- randomly select a wordline from a set of wordlines in the memory designated for an active read scan;
- perform a bit error rate (BER) check on the randomly-selected wordline and its neighbor wordlines;
- determine whether there is a BER failure on the randomly-selected wordline or its neighbor wordlines;
- and
- in response to determining that there is a BER failure on the randomly-selected wordline or its neighbor wordlines, perform a BER estimation scan (BES) of the memory.
In a data storage device comprising a memory, a method comprising:
- each time of a plurality of times that the data storage device transitions from a low-power mode to an active mode:
- selecting a wordline in the memory, wherein a different wordline is selected in response to each time of the plurality of times;
- determining whether a number of errors in the selected wordline is above a threshold;
- and
- in response to determining that the number of errors in the selected wordline is above the threshold, relocating data in the selected wordline to another wordline in the memory.
A data storage device comprising:
- a memory;
- and
- means for checking data integrity on a different wordline in the memory each time of a plurality of times that the data storage device exits a low-power mode, wherein checking data integrity on different wordlines decreases a likelilood of a read disturb error.
Dependencies are inferred from the claim text.