Harddrive read speed problem

[Omaeka]

Don't really know what could be causing this but the second anything on my HDD fragments, even if its 1 fragment inside a single 1kb file, it'll cut my read speed by two thirds.

I've been playing around with it for a good hour, fully defragging the drive and getting 70mb/s and then opening a few programs and reanalyzing the HDD to see a couple of miniscule fragments and then the read speed just dies completely. Even falls as low as 5mb/s sometimes, is this normal?

Cheers!

EDIT:

 

[mickyflinn]

What hard drive is it ?

 

[Omaeka]

It's a Hitachi Deskstar 1TB, not quite sure about the exact model though.

 

[troops]

Wouldnt get to hung up about it, get an ssd if your want the speed.