I recently just got a Giant Pack! of roms from the internet (30gigs) and I wanted to try out San Francisco Rush.
The emulator reads it as working so I try it. As soon as the game opens it says i'm missing a chd. I've been looking everywhere and I still can't figure out what this is. What should I do?

Thanks in advance

you need the sfrush.chd in your rom folder,google it and you will get it.

CHD files are disc images specific to MAME and a small number of other emulator that deal with large games that use both a romset and a disc image. Like fumanchu said earlier, you need the CHD file for San Francisco Rush, otherwise MAME reports missing files.

Thanks, I found the CHD but my pc couldn't handle the game, lol.

Yeah well, most games that require CHDs already run on beefy hardware, so one better have a top of the line computer to emulate that beefy hardware smoothly.