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%SystemRoot%\Driver Cache\I386\Drivers .cab %SystemRoot%\Driver Cache\I386\Service_pack .cab (for example, Sp2 .cab) .inf files under %Windir%\Inf .sys files under %SystemRoot%\System32\Drivers Support dynamic-link libraries (DLLs) under %SystemRoot%\System32 Third-party co-installers in various locations
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The following benefits result from maintaining a single, central store as an authoritative point from which to install driver files when new PnP devices are detected:
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Allows for potentially faster device installations, more reliable driver rollback, and a single standard for uninstalling drivers Allows you to protect drivers by using WRP Uses index files to minimize the performance impact on installing devices when the driver store grows in size as a result of the addition of new packages
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Driver Staging vs. Installation
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When the PnP service detects a new device in Windows XP, the driver files are extracted from .cab files found under %SystemRoot%\Driver Cache\I386, from .cab files on vendor-supplied media, or directly from Windows Update . The files are then copied to different locations as
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Understanding Device Installation and Management CHapTER 17
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required to install the drivers and enable the device . Installing a device on Windows XP works like this: You connect the device, the PnP service detects it, and then Windows searches the driver search path for a suitable driver and installs the device . In Windows XP, therefore, the device has to be present on (or connected to) the system for device driver installation to occur . Beginning with Windows Vista, however, device installation takes place in two distinct steps:
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Staging The process of adding driver packages to the driver store Installation The process of installing drivers from the driver store when the PnP service detects a device
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Driver staging is performed under the LocalSystem security context . Adding driver packages to the driver store requires administrative privileges on the system . During driver staging, driver files are verified, copied to the store, and indexed for quick retrieval, but they are not installed on the system . The staging process verifies the driver packages against the following criteria to ensure that the drivers will not destabilize the system when they are installed later:
The driver package must be complete and contain all files needed to install the device . This means that the INF file for the device must specify all the files needed during driver installation, and all those files must also be present . When drivers are installed, they cannot display any interactive user mode prompts or require any software-first installation facilities because Windows Vista and later versions require all device drivers to be installed under the noninteractive LocalSystem security context . PnP device driver files must be able to be installed in their entirety under the noninteractive LocalSystem security context . If the driver installation routine attempts to display any interactive user interface (UI) elements, installation will hang, timing out after five minutes . The user will be prompted to specify the location of new drivers for the device . (You can use Group Policy to modify the default device installation time-out value see the section titled Managing Device Installation Behavior later in this chapter for more information .) The INF files and other driver files must not have been tampered with or modified . The integrity of the driver files is verified by the PnP service . The driver must not be listed on the known bad drivers list, which is maintained within a DLL on the system and cannot be modified .
If the driver package fails any of these criteria, staging of the package to the driver store will fail (except in the case of the third bullet item in the preceding list) . This prevents Windows from being destabilized and possibly crashing when the user attempts to install the device requiring the package . Staging failure, however, has no impact on the system it simply means that the package is not added to the store . The device does not need to be present on (or connected to) the system when its driver package is being staged . Driver packages can be staged from media (CD, DVD, and so on) or from network locations . Windows Vista comes with numerous in-box drivers that are staged
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