dmg files

01. Launch 'Disk Utility' ('/Applications/Utilities/' folder).
02. Select 'Disk Utility's 'File, New, Disk Image from Folder...' sub-menu item. A 'Select Folder to Image' window will appear.
03. Navigate to and select the folder of which you want to make a .dmg' file of, and click on the 'Image' button. A 'New Image From Folder' window will then appear.
04. Determine where to save the created '.dmg' file, select which 'Image Format' (default 'compressed') and / or 'Encryption' (default 'none') to incorporate, and click on the 'Save' button. Within a period of time a '.dmg' file, prefixed with the selected folder's name, will appear - at the location you selected.
05. Quit 'Disk Utility'.
 
'compressed is preferred?', ?
What was stated was 'which 'Image Format' (default 'compressed')', it was not stated as being 'preferred', by myself; unless, you are directing the question at Apple - which, then the obvious answer is 'yes', since it is the default setting.

'.dmg' files are flatten files ('Resource' side contents saved within the 'Data' side), so as to be send able directly via any server (running any Operating System). The 'Image Format' is user definable. Apple chooses to compress the contents, most likely to help transfer the file quicker.

'...or shall i not have it checked in case it cause any problems?' Assuming there is a problem, with a compressed / non-compressed '.dmg' file, how would you resolve it?
 
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