Hello,

Few days ago I bought a 4TB Seagate external HDD. I what to use it as a backup drive. When I started coping files to that drive I noticed that it's really slow. Ubuntu disk benchmark test gives these results:

http://i.imgur.com/rpCIw00.png

I have another external hard drive (Samsung 2TB) and did the same benchmark for it:

http://i.imgur.com/4oluAgT.png