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Chapter 5 Troubleshooting

Verifying USB Installation for Optimum Performance

37 Quantum DAT 320 User’s Guide

Ensure That the Tape Drive is the Only Device on a USB Hub

(Windows)

On some computers multiple physical USB 2.0 ports will be connected

to the same master port, known as a “root hub”. Connecting multiple

devices to one root hub may degrade tape drive performance

degradation.

USB Mass Storage devices like Quantum DAT tape drives have the lowest

priority of all device types on the USB bus, so devices such as webcams

should never be connected to the same root hub.

To check the devices connected to a root hub:

1 Go to Device Manager and select Devices by connection from the

View menu.

2 Expand Universal Serial Bus controllers and locate the tape drive.

3 Trace the tree of devices back to the USB Root Hub and check that

the only device connected is the tape drive via the Quantum USB

Mass Storage Device. See figure 13

for an example showing a single

tape device connected to a dedicated USB 2.0 root hub.

Ensure That the quantum_usbstor Driver is Being Used

(Windows)

The Quantum USB DAT 320 drive will work with the Microsoft usbstor

driver, however, Quantum strongly recommends that you use the

quantum_usbstor driver for improved performance.

To check the driver being used:

1 Go to Device Manager and select

Devices by connection from the

View menu.

2 Expand Universal Serial Bus controllers and locate the tape drive.

3 If the tape drive is connected to the Quantum USB Mass Storage

Device, it is configured correctly (see Figure 13

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Quantum DAT 160 Betriebsanweisung Seite 52