Vaio Z HDD power management

I replaced my Vaio Z13 optical drive with a WD Scorpio blue 500gb HDD.
Now HDD is working like a optical drive, speeding up when reading and then parking immediately when reading writing is complete, so every time I read or write something on the new HDD there is a lag for about 4-5 seconds for the drive to spin up.
How can I change the hdd so it is not on so aggressive power management? or what to do?

Thanks for your help in advance

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