I put the CompactFlash Card 512 MB into ASA (5520, Version 8.0.3) but the memory is still 64 MB seen by show flash. Do I have something to configure before?
The 'show flash' or 'show disk0' commands will list statistics for the internal system flash (which is 64MB on the 5520).
Did you install the 512MB flash card into the slot on the front of the ASA? If so, you would need to use the 'show disk1' command to view the statistics about this card.
Hope that helps.