If I talk about sony 1 tb external hard disk is very usefull for us because we can save all other data instead of my other computer hard disk and also we can go any where with it by easily or safley or any one purchase it or it price is very less and warranty and service center support is very good sony gives good services and I also refers to others for that if you want purchase any products of electronice so please go with sony products I also refera to my friends for it it is very good products thanks