Dragging Across Volumes (External ↔ Internal)

• Rest one finger on the trackpad.
• Default Drag: Copies the file.
• Lift, then continue.
• Rest one finger on the trackpad. Hold Command.
• Command (⌘) + Drag: Moves the file (deletes from source).
• Lift and release the modifier.
• Rest one finger on the trackpad. Hold Option.
• Option (⌥) + Drag: Copies the file (no change from default).
• Lift and release the modifier.
• Rest one finger on the trackpad. Hold Option + Command.
• Command + Option (⌘⌥) + Drag: Creates an Alias.
• Lift your fingers. Release the modifier.

Ready