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I would like to log the data from the ECU on the harddisk. I guess it would not be the best idea to write it immediately to the HD. How much memory can i allocate for a buffer? I need about 500 bytes per second. And when and where should i write the data? I don't want to mount the music partition with read/write access.

I would dedicate a partition (or perhaps even second disk) to this.

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Also once started the app should log the data automatically in the background. Is it possible to run the player app and an own app at the same time?

Gah, I am getting senile... I think that you need to replace stock init program, but yes, it is definitively possible.
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Dragi "Bonzi" Raos Q#5196 MkII #080000376, 18GB green MkIIa #040103247, 60GB blue