WD My Passport 1 TB Wired External Hard Disk Drive (Black) Rs.3999
https://www.flipkart.com/wd-my-passport-1-tb-wired-external-hard-disk-drive/p/itmep5efqyhfgp9e

WD My Passport 4 TB Wired External Hard Disk Drive (Blue) Rs.9999
https://www.flipkart.com/computers/storage/external-hard-disks/~wd-hard-disks/pr?p%5B%5D=facets.capacity%5B%5D%3D4+TB&sid=6bo%2Fjdy%2Fnl6

WD My Passport 1 TB Wired External Hard Disk Drive (Yellow) + Rs.150 Cashback for Rs3999 @Flipkart
https://www.flipkart.com/search?as=off&as-show=off&otracker=start&q=WD+My+Passport+1+TB+Wired+External+Hard+Disk+Drive

You will get a cashback worth 25% of the price of the Eligible Product subject to a maximum of Rs. 150, which cashback will be credited into Your PhonePe wallet within 24 hours of successful placement of the order of the Eligible Product on the Platform. Offer is valid from April 17, 2017 (00:00:00 hrs) to April 19, 2017 (23:59:59 hrs).