Macbook as MPC 2500 Hard Drive?

Is it possible to have your Macbook as a way to use it as a HD for samples? The Flash card doesnt hold much so this is a noobish attempt on getting more out of what i bought

Sure... that's what the USB is for.
So you need more than 2GB on a flash card for samples and programs? Damn... you would have really hated using floppies back in the day then.
Or... just install an internal 150GB HD.

i Think You Should Install Internal hard disk For This It Will Be The Better Option For You!