Strange Access Time fluctoation of my WD Black 750GB, need advice..

Hello, guys,
I bought last year this HDD and since day one it shows very strange behavior- its access time goes up and down like crazy on hd-tune benchmark:

1st try:



2nd try:



It is always like this...

What is wrong with this HDD? I am thinking of replacing it with 500GB Scorpio black (512 bytes sector)..

 

If you're testing this with a Windows 'proper' install, then there is probably nothing wrong with the drive.

(Proper install: no tweaks, clean install, latest/proper drivers and allowed to do all necessary background tasks a clean install entails).

You can try this:

In an elevated command prompt type:
start /wait Rundll32.exe advapi32.dll,ProcessIdleTasks

and hit enter. When the flashing prompt shows again all background tasks will have completed and HD Tune should have the O/S's full attention.


You should be doing the above every time you run any type of benchmark - see if two or more run this way are more consistent for you.



The second way you can try is to boot into Windows Safe mode and run your benchmarks (they should be the best 'scores' the drive can achieve).


All that is happening is that Windows is initiating a background task and is giving you variable 'scores' - I hope that the above two methods will give you a way to get more consistent results in your benchmark runs.

(P.S. I don't think a downgrade to the 500GB HDD will give you any additional benefits (but will make you possibly lament the loss of the capacity you gave up).