downloaded movie file too large for flash drive
I downloaded a movie in HD onto my computer but I want to put it onto a Sandisk 32 gig flash drive. When I tried to drag it to the flash drive, it said the file could not be copied because it was too large for the volume's format. The site I downloaded the movie from said something about using IGetter. I have Igetter in my applications but it won't open because it says it is from an unidentified developer. (This may have been a pre-Yosemite download.) Anyway, my question is, is there any way to download and/or save a movie to a flash drive?
iMac (21.5-inch Late 2009), OS X Yosemite (10.10.5)