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In general, the number of nines is not often used by a network engineer when modeling and measuring availability because it is hard to apply in formula. More often, the unavailability expressed as a probability (like 0.00001), or a downtime per year is quoted. Availability specified as a number of nines is often seen in marketing documents.
(To appease the Apple-fans: the windows graphical software was, at the time, years behind Apple graphics software.) All in all, the only possible 'sources of confusion' I can see are these: - Microsoft consistently uses DPI for PPI (where 'PPI' stands for 'screen-pixels per inch') and the dialogue box used to adjust the value, insists that one ...