How to force delete any unwanted layers ?
When PURGE command failed to remove any unreferenced layers.
When deleting any unused Layers in Layers Properties manager, this message will prompt out;
The solution is by using LAYDEL command,
1 : Type LAYDEL > ENTER
2 : Select the entity on the unwanted layer to delete. This will delete the Layer and all the entities which are assigned to it.
3 : or Type N > Enter
This will prompt you a dialog box with the entire Layers name. Select the unwanted layers and click OK.