Because there are several different sources of roms, sometimes you download individual rom files or sometimes you download merged sets. How you store your roms is completely up to you. I choose to keep all my rom files split as it is easier to update however if you merge all of the rom files you can save a lot of disk space. Open the merger window from the start window...
Heres a run down of the options.
|You want to create|
|Non-Merged Sets||All rom files will have all the necessary roms to run them.|
|Split||Rom Files will be split into parent and clone files.|
|Merged Sets||Parent and clones will be merged into one set.|
|Compress Files||Compresses the new files.|
|Clean Set||Removes unneeded files from sets.|
Lets you select rom sets by which games system they belong to.
|Keep Original Position||Keep file in same folder.|
|(Un-)Merge Parents/Clones To||Sets up a different folder to generate file sets in.|
What I did to sort out my rom sets was to run merger and select "Non-Merged Sets" which created a set of roms with all the necessary files they needed to run in them. This used up 3.5GIG of hard disk space. I then ran scanner as if they were split sets and removed all of the unneeded roms. This left me with only split rom files and no merged ones.