A method includes responding to a wear level operation request by copying data from a first portion of a first memory array to a second portion of the first memory array, and copying metadata associated with {HEAD ~ the data} from {TAIL ~ a third portion} of a second memory array to a fourth portion of the second memory array 
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A method includes responding to a wear level operation request by copying data from a first portion of a first memory array to a second portion of the first memory array , and copying metadata associated with { HEAD ~ the data } from { TAIL ~ a third portion } of a second memory array to a fourth portion of the second memory array
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