Maybe there is some insect (aka a bug) in my iMac and I'm not (and don't plan on ever being) familiar with the complexity of performing otherwise simple (think Windows) operations but that stated it seems clear that failure msgs. have no meaning - perhaps experience indicates that it indicates success but that isn't clearly always the case - although with the level of dysfunction which seems to be normal - how could one tell? The areas that this has apparently been confirmed in are Disk Mgt. but also elsewhere; perhaps this seems and is normal for those who only use Apple OS so I would be interested to hear from anyone who has transitioned from Windows to Mac and has found it to be other than grossly inferior in most respects.