I'm studying for the CCSP exam and one of the BC/DR terms that is referenced in my study material is "Maximum Allowable Downtime". The definition for it is:
MAD (Maxium Allowable Downtime) How long it would take for an interruption in service to kill an organization, measured in time. For instance, if a company would fail because it had to halt operations for a week, then its MAD is one week.
The study material book I'm reviewing actually didn't mentioned MTD anywhere but my understanding from other resources is that Maximum Tolerable Downtime refers to the amount of time that can pass before an "event" can reasonably be considered an impactful "disaster" (of course with the understanding that exceptions occur)
The definition of MAD above though, sounds way more... permanent/absolute and far worse than a disaster.
So, is MTD and MAD the same thing? Is this just the author writing it in a creative way? Or are there distinct/notable differences between Maximum Tolerable Downtime and Maximum Allowed Downtime?