I have an HP XW Workstation 8200, which has a SCSI drive as its' C drive. I am trying to access some external drives--most have either USB or Firewire. The computer recognizes them when they are plugged in, they are seen in the Hardware section by the control panel, but they do not appear in 'My Computer' and I cannot access them. I can however, eject them by 'safely removing hardware'. What do I have to do to see these drives and to access their files?