How to fix slow hard drive?

Hello,

I use "WD10EARS", or more descriptive: Western Digital, SATA 2, 1TB, 7200rpm, 64MB cache. I have no idea what's the problem, but the average speed of the disk is 5 MBps and it's awful. I tried defragmenting, some WD disk checker, disabling win write-cache buffer flushing... etc. but nothing helped.
Motherboard: ASUS P5KPL-AM SE

A month ago I was using WD, SATA, 320GB, 7200rpm, 8MB cache and it was 5 to 6 times faster than this one.

Any suggestion ?

* http://0.mk/5742 - Same question, but without any useful answer
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More about slow hard drive
  1. Fixed!

    Just changed the SATA cable... probably it was too old.
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Hard Drives Western Digital Cache SATA Storage