Quote Originally Posted by logiqit
Chances are that your 1.5TB disks onlly have about 1.36TB or so of actual space.
Correct.

For HDDs 1.5TB disks have 1,500,000,000,000 Bytes

For all other computers components 1.5TB is (correctly) 1,649,267,441,664 Bytes

The difference is 9.1%.