Re: Confused
The first calculation is for 100TB. They assume they need to cater for 150TB of storage (RAID perhaps?) and hence to provide 100TB, they need six servers of 25TB each.
So those servers cost you a one-off $30,000 which, divided by 100,000 GB (yes I know...) and divided by 36 to get a monthly priced by GB over a three-year period (i.e. you write-off the servers after three years) gives you...
... drum roll please....
... the $0.0082 per GB per month quoted.
Really can't be bothered with the rest of the calcs... someone else can take it from here!