The company I worked for in Australia, when we did digital distribution, we used harddrives. And we weren't the only ones, a lot of the other companies the movie theatre's dealt with also supplied harddrives, as all of the theatres aren't able to download the files.
Originally Posted by SilverGlow
Granted, we are a smaller market than the US.
The second comment is true. The error rate is incredibly low for that exact reason. The errors we came across where introduced when digitizing the file the first time more so than afterwards.