The problem is that USB device does not work on FreeBSD 9.1 when memory is over 320GB. You can follow below procedures for workaround:



1. Boot up install CD, press [2] or [ESC] key to loader prompt then set kernel parameters as below and continues installation process.



OK kern.maxbcache="128M"


OK vfs.maxbufspace=134217728


OK boot



2. Select 'Yes' when this message comes up: "The installation is now finished. Before exiting the installer, would you like to open a shell in the new system to make any final manual modifications?"



3. Use vi to add new file /boot/loader.conf with below contents:



kern.maxbcache="128M"


vfs.maxbufspace=134217728



4. Save it and continue the normal installation procedure.