Friends, I am using this hard disk from 5 to 6 days but it still had no error in it it works smoothly and you can store your data in it and it is removeable. From now we can save our old pictures , viedios etc .easyily by buying wd my passport 4 tb you can also take it any where with you it has no more weight it is light in weight so you can buy it if you had a access data in you laptop or computer