> Thanks a lot for your input, gentlemen, but after I downloaded the area51 chd in .zip > format (had it in .7z because I had to delete it along with the rest of my collection > to free some space) the problem "mutated" into a missing chd/rom files error, but I > just found what I needed and now I'm shooting things like crazy again thanks again > and good day!!
You should never zip or 7zip or rar or anything else .chd files. They have internal compression (so you won't gain any significant space anyway), and putting them in a zip or 7zip defeats the ability of MAME to stream the data and forces the file to be unpacked into memory which will take hundreds of megs for area51.
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