WSUS与Windows 10和Windows 10 GDR-DU产品之间的区别

在WSUS配置的“选择产品”屏幕中,Windows 10 GDR-DU和Windows 10都有一个选项：

两者有什么区别？我找不到任何解释产品之间差异的Microsoft文档.

GDR-DU表示一般分发版本(动态更新)

可悲的是,TechNet似乎没有资源为此写过.从我拥有的信息中保存文件以便从构建升级到另一个,以防止重新安装新系统(如build 1511到1607). (不适用于正常更新).

官方(但在存档的邮件列表中)来自Microsoft源的GDR-DU的描述. (https://marc.info/?l=patchmanagement&m=147085158401556&w=2)

GDRDU just means that when you install Windows 10
1607,it will automatically download and inject the
update as part of the upgrade process,as long as
dynamic update is enabled (which is the default).
It’s a mechanism to get fixes in place without
refreshing the entire OS image.

看到那里的快速信息,而不是官方的,但仍然指向相同的答案比微软的来源：http://www.urtech.ca/2016/12/solved-what-do-the-windows-10-product-names-mean-in-wsus/

Windows 10 GDR-DU: GDR = General Distribution Release,DU=Dynamic
Update. These updates are only used by the current GDR build of
Windows 10 when it is trying to perform a Dynamic Update (see item 5
above).

Item 5: Windows 10 Dynamic Update: This includes only updates to the
setup process that occurs when one build of Windows 10 is trying to
update to a new build of Windows 10 (i.e. 1511 to 1607).

GDR-DU的更一般描述.

By default,all components on Windows systems start on the GDR branch
following each major release. When you install updates from Windows
Update for a GDR component,it gets upgraded with the GDR version.

When you install a specific Hotfix,the files and components in the
Hotfix package are migrated to the LDR branch. At this point,that
particular component is marked as a LDR component. If you install a
newer Update over this component,the Windows servicing technology
will automatically install the appropriate latest version from the LDR
branch for you. This is possible because each Update package ships
with both the GDR and LDR versions of the component.

Once a component is marked as a LDR component,the only way to move
back to the GDR branch is to uninstall all Hotfixes for that
component,or move to the next available service pack.

引自https://blogs.msdn.microsoft.com/ntdebugging/2008/10/21/windows-hotfixes-and-updates-how-do-they-work/的文字

接下来的问题是,为什么你可以在没有动态更新的情况下单独选择GDR-DU.