Consider the following scenario:

• You have a Windows Vista-based computer that uses an Open Host Controller Interface (OHCI) host controller. This OHCI host controller is Institute of Electrical and Electronics Engineers (IEEE) 1394-compliant.
• You have two IEEE 1394-compliant storage devices.

In this scenario, you may experience one of the following issues:

• When you start the computer and connect the first IEEE 1394-compliant storage device to the OHCI host controller, the device is loaded correctly. However, when you connect the second storage device, this device never appears in Device Manager. Additionally, the first device disappears from Device Manager.
• When you connect the two IEEE 1394-compliant storage devices before the computer is started, neither device appears in Device Manager after you start the computer.