If your USB drive(s) are hooked up at that time of the install, then that's not normal behavior.

If they aren't attached at the time, then they may indeed be grayed out and not accessible.

Stop the Install program by cancelling, then attach the drive you wish to use and start the Installer again.

If its not that, something else is strange there.

You do not have to install to main drive and then copy later.


--Mac