Card storage
While true a PCMCIA card can store 25 hours of data not all system function in this manner. The IHUMS system is designed to be downloaded after every flight or at a maximum 24 elapsed ( not flight ) hours. If this is exceeded data could be over written and you will only be left with the last flight.
You must also consider the exceedance monitoring function. With this in mind you should be looking at a download, and review of the data after every flight.