input_fname : str 
Path to the data file (extension .bin). The header file with the
same file name stem and an extension .txt is expected to be found
in the same directory. 
 
preload : bool or str (default False) 
Preload data into memory for data manipulation and faster indexing.
If True, the data will be preloaded into memory (fast, requires
large amount of memory). If preload is a string, preload is the
file name of a memory-mapped file which is used to store the data
on the hard drive (slower, requires less memory). 
 
verbose : bool, str, int, or None 
If not None, override default verbose level (see mne.verbose). 
 
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