I wonder why use SP compact flash?

[Soon Kwan Kwon]

I recommend that you should see the below photo.

1. sp_compact_flash.png   =>  maybe I know this is compact flash adapter

but Is it right another name "SP compact flash" ?  if not, what is SP (compact flash)?

2. compact_sp.png  vs instead_of_compact_flash.png + forward_compact_flash.png

           (   1    )                                                          (    2    )

=> I usually did like (2) mode. I don't know difference between (1) and (2) mode..

3. compact_sp.png, instead_of_compact_flash.png

In this picture, there is RED box I indicated. 

=> I know compact flash.. but what is another one? maybe RAM?? right?

[Joseph W. Doherty]

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The older sup720s had on-board (fixed) flash that was insufficient for the later IOS images.  So, Cisco replaced it with a CF module, which supports much more MB.  Believe there's also a kit to replace the original flash with a CF module adapter.