Symbolic links can be used to create a single html file with Dirhtml that contains links on multiple disks.
Here is a program that can create symbolic links, though they can also be created with the command line:
Symlink Creator
To create a multi-folder html page with dirhtml, follow these steps:
* Create a new folder (anywhere)
* Using Symlink Creator, create symbolic links to specific folders of interest, and save them to the new folder (create folder symbolic links)
* Build the html file using the new folder as the target folder.
A few notes:
* If a symlink used to create the html file is deleted, generated links won't work.
* It's not clear if html files built using symlinks will work properly on non-Windows systems, though x-based systems also have symlinks.