This issue comes from the calculation of the space, the producer consider it 1000 bytes is a kb when in reality is 1024 bytes. With the new math 8.000.000.000.000 bytes divided by 1024 4 times (1st time to get kB, 2nd time to get MB, 3rd time to get GB, 4th time to get TB) you get 7,276 TB. This is your real storage space.