>>15492399
Copy protection schemes on the discs themselves and the way they're printed/manufactured, preventing accurate copies from being burnable, though it can be circumvented with various methods depending on the console, and without using a modchip.
>Gamecube
Using Cubesoft's Phoenix with the Gamecube Broadband adapter and Phantasy Star Online (honestly not practical, due to the rarity of the required peripherals, or simply use the Action Replay/Datel SD Media Launcher exploit, note that discs will have to be burnt to MiniDVD's for obvious reasons.
>PS2
Install Free McBoot using 007 Agent Under Fire and a burnt disc, then use ESR disc patcher/launcher.
>Saturn
Get a Saturn Action Replay cart, and use a burnt disc and swap trick to install PseudoSaturn.
>PS1
Get a PS1 Action Replay (the one that plugs into the parallel port) and use a burnt disc and swap trick to install UniROM (similar to PseudoSaturn).
>Dreamcast
Will load burnt discs out of the box as long as you use CDI format since Sega used crappy, easily-circumvented copy protection on the GD-ROM format.
>Wii
Use HackMii/Letterbomb hack, honestly one of the most-trivial consoles to hack besides the PSP.
>Xbox
Buy a USB to Xbox controller port adapter, and use a flash drive with Splinter Cell or Mechwarrior to load a custom dashboard and XBMC or something with the flash drive in-hand.
>Turbo CD, Phillips CD-i, 3DO, and Sega CD
No copy protection out of the box, since consumer CD burners were a foreign concept at the time they came out.
>Xbox 360
You can Jtag your console I guess, but even that isn't possible without cracking it open and doing some basic soldering work on the motherboard. On earlier consoles you could flash the DVD drive to simply load burnt discs if you had a way to plug it into a computer.
>PS3
I don't think it's possible to load burnt Blu-Rays on here even when it is hacked with PS3xploit or whatever, could be wrong though, and if you're on a CECH3XXX model or higher you're basically fucked since it's impossible to properly softmod or load CFW on them.