I finally got around the archiving the various Dreamcast Magazine demo discs (at least the US versions). If you care about the technical details of how I accomplished this, I have written up the details over on my programming blog.
These are various sampler/demo discs that were released for the Sega Dreamcast in the North American market. There were 2 Generator discs and 10 Magazine discs, labeled volumes 2 through 11 (apparently, the first issue of the Dreamcast Magazine did not come with a disc). Many of these could already be found in collections at the Internet Archive. The innovation I am trying to provide is to allow access to the individual assets by making available ZIP files of the CD-ROM and extended GD-ROM data areas, as well as any audio tracks in each region. These are difficult to examine with the standard opaque rips.
Dreamcast Generator Discs:
Dreamcast Magazine Discs: