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Managing Hardware Devices and Drivers
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The way to update a driver is nearly the same as that for manually installing a device driver: from the device s Properties dialog box, illustrated in Figure 10-2, click the Driver tab and click Update Driver. The Hardware Update Wizard asks for the new driver s location and installs the driver. Some drivers will require a restart of the computer after installation, but drivers for most peripheral devices will not.
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Occasionally, a new driver will not function properly or might cause unanticipated conflicts with other devices. Device Manager allows you to remove the updated driver and return to the previous version of the driver a process called roll back. Windows Server 2003 automatically backs up a driver that you replace through the update driver process, so that it is available using the Roll Back Driver option in the Driver tab of the device s Properties dialog box, shown in Figure 10-3. We discuss the difference between this feature and the Last Known Good Configuration startup option in the next lesson.
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Configuring Hardware Devices and Drivers
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Figure 10-3
The Roll Back Driver option
Uninstalling Drivers
You can uninstall drivers using Device Manager. You initiate the Uninstall Driver process from the Driver page, as shown in Figure 10-4.
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Figure 10-4
Uninstall Driver
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10
Managing Hardware Devices and Drivers
Uninstalling a driver has different effects depending on whether the device was detected and configured using PnP. If the device was configured using PnP, removal of the driver will result in the removal of the device from Device Manager as well. If the driver for the device was added manually, the device will remain visible in Device Manager but will not be configured with a driver.
Reactivating an Uninstalled Device
If you choose to uninstall a PnP device, Windows Server 2003 removes the device from the configuration even if the device is still connected to the computer. To reactivate the device, you must scan for hardware changes using Device Manager. Select the root node in the Device Manager tree the computer and then open the Action menu and choose Scan For Hardware Changes. Alternatively, use the Add Hardware Wizard in Control Panel to detect and reinstall the device. If you uninstall a non-PnP device, you must reinstall the device to reenable it.
You can right-click any node in Device Manager and choose Scan For Hardware Changes. Doing so with a controller limits the scan to devices connected to the controller. For example, if a device connected to a USB controller does not appear, you can select the controller and scan for hardware changes to detect the device.
Resource Configuration
Devices and their drivers require system resources to communicate with the device. Windows Server 2003 automatically configures these resources for PnP devices, including IRQs, I/O Ports, DMA settings, and memory ranges. Because such resources are limited, Windows Server 2003 allows devices to share resources. In rare circumstances in which resources must be statically configured, Device Manager allows you to control the resources assigned to a device on the Resources tab of a device s Properties dialog box, shown in Figure 10-5. To change the resources assigned to a device, clear the Use Automatic Settings check box. Now you are able to set each resource by selecting it and clicking Change Settings. Any resources that cannot be assigned manually will not appear on the device s Resources tab.
Any resources configured manually make both the resource and the device unavailable for automatic configuration. This limits the ability of Windows Server 2003 to make adjustments to resource allocation and might lead to problems with other devices.
Caution
Lesson 2
Configuring Hardware Devices and Drivers
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Figure 10-5
The Resources tab of a device s configurable Properties
Disabling and Enabling Devices
You can disable or enable devices using Device Manager. On the General tab of the device s Properties dialog box, the current state of the device is displayed in the Device Usage drop-down list. Disabling a device allows you to isolate hardware without uninstalling it. For example, you might receive event log notifications that a CD-ROM is malfunctioning. To allow the server to remain online without generating event log messages and to reduce the possibility that the malfunctioning CD-ROM would cause conflicts with other devices or the operating system, you might choose to disable the CD-ROM.
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