Best is SBInducer way - with it you can make easly snes and nes emus with roms on one disc.
Jump to
http://consolevision.com/members/sbiffy/files/
and grab
Sbindv4.exe
next go to
Emus dir and grab sbi packs:
of Nes emu - best is
NesterDC_7.1.sbi
and Snes - there are two good but not perfect:
DreamSNES-0.9.8.sbi and
Sfamicast_V1_bO.sbi. I'd prefer the first one
Install
Sbindv4.exe and put your sbi packs to sbi subdir inside instalation folder.
put your nes roms to subdir
games and snes roms to subdir
snes in Inducer dir
Follow with tutorial...
http://consolevision.com/members/sbiffy/tutorial.shtml
...but do not burn it with 12x. The best is 8x