Dynamic Update is a new feature that is only found in Windows XP. It lets you connect directly to a network source, either the Windows Update site or a shared folder on your own network, to find critical fixes and drivers needed to minimize setup difficulties.
Dynamic Update needs an Internet connection or the ability to connect to a network share containing updates that were previously downloaded from the Windows Update Corporate Catalog.
For upgrade installations, the version of Windows being upgraded must contain the WINENET.DLL and SHLWAPI.DLL files from Internet Explorer 4.01 or later.
Dynamic Update takes place by default when performing an unattended upgrade, but can be disabled by adding the following key and value to your answer file: DUDisable=yes.
You can disable Dynamic Update by using the /dudisable switch. This will also override and answer file that is set to allow Dynamic Update.
You can minimize traffic on your outbound Internet connection by downloading update files from the Corporate Windows Update site and mounting them on a network share (eg: \\SVR5\DYNUPDATE) and using the switch: winnt32.exe /dushare: \\PSVR5\DYNUPDATE for an upgrade installation.
The /dushare switch (used in conjunction with the /duprepare switch) can be used to copy all files downloaded by Dynamic Update to a network share for use by subsequent installations. You must create a shared folder on a server in advance.
Dynamic Update downloads consists of two types of files:
- Device Drivers: these are only downloaded for devices that are connected to the computer but for which there is no existing driver on the CD-ROM or distribution point. If there is an existing driver already, the updated version will not be downloaded unless it has been tagged as a "critical fix".
- Replacement Files: Dynamic Update checks to see if there are any critical fixes or updates for files currently available on the installation CD or distribution point. Updated files are downloaded, but any new files that don't appear on the CD are ignored.
Next: Dual-Booting Windows XP