This UnionSine product is easy to use and due to its size and portable design, is ideal for transferring or backing up files to and from your. 1x UnionSine External Hard Drive. 160GB≈149GB, 250GB≈232GB, 320 GB ≈ 298 GB, 500 GB ≈ 465 GB, 750 GB ≈ 698 GB, 1 TB ≈ 931 GB, 2TB ≈ 1.81TB, 4 TB ≈ 3.63 TB，6 TB ≈ 5.45 TB，8 TB ≈ 7.27 TB，10 TB ≈ 9.09 TB，12 TB ≈ 10.91 ТB，14 TB ≈ 12.73 TB，16 TB ≈ 14.55 TB，18 TB ≈ 16.37 TB.
