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To answer questions 2 & 3, FORGET IT!!
Original Dreamcast games are on special discs called GD-ROMs (Gigabyte Disc ROMS) and cannot be read in their entirety by ANY drive other than a GD-ROM drive. A Dreamcast has a GD-ROM drive built in (obviously), but unless you were a software developer for Sega on their Dreamcast team, it's unlikely you have a GD-ROM reader or writer on your computer, nor would be able to get your hands on one.
The only way to read the data from a GD-ROM short of having a GD-ROM drive is to attach your Dreamcast to your PC by serial cable (or network cable using the impossible to fine, Broadband Adapter). Then you have to run special software on your Dreamcast and your PC to allow you to "RIP" the game data.
Once the data is on your PC (usually it takes overnight to do this), you have to extract the data using a tool such as WinZIP. Now you have to downsample all audio/video files so they're much smaller, remove any unnecessary files (such as foreign language support) so as to save space. All the .BIN files must be hacked so they'll work on a COPY rather than a GD-ROM, and then the entire collection must be burned back to a CD-R disc by following a special set of instructions called a "Self-Boot" tutorial.
If you did everything just right, and you're very lucky, you might get a usable game the first attempt, but odds are it will take much trial and error before you get it all figured out and working.
DVD drives will not read anything larger than a 700+mb CD-R, unless the disc is actually a DVD. A GD-ROM is not a DVD, therefore the DVD drive **WILL NOT READ IT COMPLETELY**. It will read the small CDROM header that the standard CDROM drive will read, and that's it...
Well, have fun with your attempts...
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