How To Cut Down On File Size (MB, GB)

[searles]

My MameUI32 is 16.8GB. Is there any way that I can get rid of the roms that aren't working, in order to cut down on file size?

[azoreseuropa]

just delete rom that you dont want in the roms folder. :)

[Jale]

If supported, you can compress them with ZIP format.