for media error processing flash memory data integrity operations these bits can be seen in table 1 the refreq bit d 2 will be set as a request for the host to initiate a refresh operation this request is not considered urgent the host will honor this request in as timely a manner as possible without sacrificing user interactivity the second bit refrequrg d 3 is an urgent request for a refresh operation this host must find a way to honor this request as quickly as possible without regard for effects on the user experience from the memory controller firmware perspective these requests can be implemented by using the presence of scrub or update requests whenever the queue holding block scrub requests goes non empty a request for a slot of time to go off line is made to the host device this request is made via the refreq and refrequrg bits in the status 1 register urgent requests are either important yet time efficient safety events such as copy block index saves or critical time consuming but low frequency events such as the queuing of more than 4 block copies the queuing of 4 block copies is preferably used to denote an urgent request in the case where the queue holds eight total entries in other words when the queue is 50 full the request will be an urgent request the range in the ratio of entries to available slots of the queue used to indicate an urgent request may be anywhere between ten and ninety percent the ratio selected will affect the performance of the overall system and may be tailored to each application a lower ratio will require the host to respond more quickly and may result in higher data reliability.