Sleep issue on Array of WD RE WD2004FBYZ

Hi,

My PC boots up on an SSD drive and I have an array 1-0 of 4 WD RE WD2004FBYZ drives.

My issue is no matter how hard I try, there is no way I can prevent the array from going to sleep every 15 minutes.

Windows 7 power settings does nothing, I also have a batch file running on logon with the following:
powercfg -CHANGE -disk-timeout-ac 0 and it does not make it.

Any ideas please? it is very annoying especially since few PC requires access many times a day.

Thanks