I am having trouble with my Samsung SV120H Hard Drive. This past month my drive been acting up. Whenever I transfer files from a different drive to the Samsung drive it would take more time than usual. The window that pop up and show estimated time would jump from 5 minutes to 50 minutes and after 10 min the estimate would drop back down to 20 minutes and would jumped back to 50 minutes. My usual time to transfer 10 files (each file are about 200 megs) is about 1 to 2 minutes. But now its taking about 30 minutes.
I also used a program HD Tune and it showed some erratic read and write
Write

Read
I want to know if this is a prerequisite to total hard drive failure? If not is there any fix for this problem?