"These cards are based on flash memory technology which is non-volatile. That means it does not require power to retain its data. As such, it will not lose data even if disconnected from the host device or any power source. This is completely opposite of volatile memory technologies like SDRAM and RDRAM, where the memory cells have to be periodically refreshed to retain their contents."
FULL STORY @ ROJAKPOT (http://www.rojakpot.com/Reviews/ACE_64MB_CompactFlash/ACE_64MB_CompactFlash_01.htm)