There seems to be a conflict with the Network Assistant (2.0 and 3.0) extension and the VST Firewire Hardrive drivers. The drive will not mount on boot up nor will it mount using the utility. The drive mounts normally after removing the Network Assistant extension.
Workaround:
Update to Apple Network Assistant 3.5. There is a trial version on the Apple Software Updates Web site at
http://www.apple.com/swupdates.
If this resolves the issue, the product can be ordered through the Apple Software Order Center at 800-293-6617. For more information visit:
http://www.apple.com.