Possible ways to save 40Kbytes/Second?

I would like to know what are the possible ways to save 40KBytes per second? what type of memory devices do i have to use. I presumed of using class 10 memory card but it has only 10Mbitspersecond (= 1250KBytes/second). I would have to store atleast 480KBytes( 14 seconds) in some kind of memory format and the data acquisitioned should be readable in computer for data analysis. not sure how to do this? do I have an option of storing data lets say 240KBytes in some location of memory and then transfer to memory card/ or some memory device ?