That is a good metafor. Someone might say, it is not really erased, is it is just the pointer that is deleted. Someone else says, there are still traces of magn

That is a good metafor. Someone might say, it is not really erased, is it is just the pointer that is deleted. Someone else says, there are still traces of magnetic field left, just much weaker. But if the disk is put in a shredder we can be sure it will never be read again - it is truly dead.