Use the Purge command to get rid of unused block definitions. This can happen when all instances of a block have been deleted. If a block definition uses the layer, you cannot delete it. This is why you sometimes have trouble deleting layers. In both cases, there need not be any actual instances placed in the file for the block definition to exist in the file. The difference, of course, is that the definition refers back to the external file and can be updated as well as any instances that are placed if the external file is changed. What you see on screen is an instance of geometry. The block definition is sucked into the current file and saved with it. If you insert another 3dm file as a block instance, a similar thing happens. Existing block definitions available for inserting are on a drop down-list in the Insert dialog box. You can insert as many instances of this definition as needed with the Insert command. It saves the block definition (the geometry you selected to define the block) in the file. When you make a block in Rhino from geometry in the current file with the Block command, Rhino replaces the geometry you selected with a block instance.
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