Encoded information, including first data and second data that was derived using the first data, is received. The second data can be used to determine the accuracy of the first data. The first data is stored in a first memory location that has a first address, and the second data is stored in a second memory location that has a second address. First information that is useful for determining the first address is stored, and second information that is useful for determining the second address is stored. Accessing the first data using the first information also causes the second data to be accessed using the second information.
