I have a 320GB Firewire WD Passport external hard drive, which I use to make a nightly bootable clone of my boot drive. Regardless of whether I'm trying to boot from it or just restarting my computer normally, the drive doesn't show up until I unplug and plug it back in. This works but it's annoying, and I would love to fix this permanently if anyone knows how. In case it matters the system is a mid 2009 Mac Pro. Thanks in advance!