Coupon: OXIGEN2020 2TB Capacity No External Power Needed http://www.ebay.in/itm/Dell-Portable-Backup-2-TB-External-Hard-Disk-/271794651664 Specifications Brand Dell Model Portable Backup Hard Drive Connectivity USB 3.0 OS Supported Windows: 7, 8 Form Factor Portable Transfer Speed USB 3.0: Upto 4.8 Gbps Color Black Features Power Consumption: 8 W, Power Source: USB Bus, Interface Type: 1 x Super Speed USB, Lightweight and Portable, Easy-to-use Backup Software is Pre-installed, Works with Popular Social Media Sites, USB 3.0 for Faster Data Transfers In The Box Hard Drive Weight 158.75 g Dimensions 113.5 × 75.9 × 12.19 mm Model Name Portable Backup Hard Drive RPM 5400 Capacity 2 TB Size 2.5 inch