The size of these files is very small. If you are using MAME for console games, chances are that you are downloading games you will probably never play. You should be looking in the roms folder and deleting games you don't/won't play. Those will make the most impact in saving space, especially the CHD files. Also, check to see if you have multiple copies of games and keep just the version of the game you will play.
Don't be discouraged by some of the response you get. Some people forget that they were new at one point.
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