Hi Midnightdraven,
Thank you very much for your answers
I think there's a bit ambiguous in naming.
Do you mean:
Directory /System/ is System Mermory
Directory /Device Memory/ is Device Memory
OR
My guess is correct? directory /System/ + directory /Device Memory/ = Device Memory
I think directory /System/ isn't System Memory, because after removing 72MB of sample movies from /System/, my File Free still same ~ 27MB