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Resizing a .dmg image - os x

1. Mount the image
2. Delete the files you don't need.
3. Dismount image.
4. From the terminal : hdiutil resize -size xx{m or g} /PATH/TO/DISKIMAGE.dmg

xx= the size you want the image to be.

Use either M for MG or G for GB

i.e. hdiutil resize -size 25g ~/Desktop/mystuff.dmg

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