How can I (1) use an external trigger to cause data acquisition from my session based DAQ, (2) save the acquired data to an external disk, and (3) repeat for a specified number of triggers.

I'm trying to acquire data ever time their is a trigger from a pulsed source. I can easily use the USB-6001 to acquire a single set of data from the trigger, but I can figure out how to (1) get the process to repeat with each trigger and (2) how to sequentially save the data after each triggering event. Any help/advice would be helpful.