Confirming memory marks indicating an error in computer memory including detecting, by memory logic responsive to a memory read operation, an error in at a memory location; marking, by the memory logic in an entry in a hardware mark table, the memory location as containing the error, the entry including one or more parameters for correcting the error; and retrying, by the memory logic, the memory read operation, including: responsive to again detecting the error in the memory location, determining whether the error is correctable at the memory location using the parameters included in the entry; and if the error is correctable at the memory location using the one or more parameters included in the entry, confirming the error in the entry of the hardware mark table.