Flash Digital Memory

Flash Digital Memory
What is the difference between "Secure Digital" and "Secure Digital Flash" cards?

I am looking for a memory card SD and see that some are called "Secure Digital" and others are called "flash Secure Digital." What is the difference? Are interchangeable in my devices that use SD cards?

They are the same thing. Secure Digital (SD) is a registered trademark so any card with the SD logo works with SD devices. The following link will take you to the association.

Samsung SMX-F34SN Digital Flash Memory Camcorder