Originally Posted by JustinGTP
Most vehicles have what they call a "black box." It would not be user accessible or changeable as they use this information in the state of a crash to determine reasons as to WHY the crash may of happened. I am not sure on what BMW uses.
But I believe these black boxes only store a few seconds of information. They are interested in only the conditions immediately preceeding a crash. So history further back than a few seconds isn't kept.