As per new design D70 have a higher capacity buffer that allows to take simultanions images and than it writes to memory card regardless CF or MDrive.
Now in that case does it really matter if you have avery high cpacity card or not because while it is in buffer and it is writing to CF or MD memory you always can take more pictures without waiting to let it write everything on Memory card right ?
#1. "RE: CF or MD Speed matters ?" In response to Reply # 0
Here's my version of how to explain why you need a fast card:
You have a sink (buffer) Plug it up and turn on the water to fully open (take continuous pics e.g. 3 fps for as long as you can hold the shutter down) This will fill up the sink (fills up your buffer)
You have a cup (speed of a regular card) You want to fill up the bathtub (capacity of the card) You can only empty the sink one cup at a time (how fast the card can take info from the buffer)
Now imagine you have a 5 gallon bucket (faster card speed) You can empty that sink a whole lot faster and you can take more water in the sink (the fast card can write empty the buffer quicker)
High capacity only matters to how many pics you want to store before switching out a new card or downloading pics to your computer. To continue my analogy example, capacity would be the size of the bathtub you want to fill.
#2. "RE: CF or MD Speed matters ?" In response to Reply # 0
D70 was designed to be very efficient at processing images. It is capable of sustaining a relatively high (3) frame rate, over a long period, provided it is paired with a high speed card. If one simply doesn't need this sort of frame rate, the microdrive would be a fine choice. On the other hand, D70's buffer for NEF is quite small, so the added speed will be useful when shooting NEF.
Using D2H as an example, a high speed CF card will store images roughly three times as fast as the microdrive.