Windows 7 - Disk Activity Led having a heartbeat

Hello guys,
I am having trouble lately with my disk drives. First of all the specs and then the problems :

Motherboard : Gigabyte P67A-UD4-B3
Hard Drives :
WD1002FAEX (Caviar Black Drive 1T)
WD10EADS (Caviar Green Drive 1T)
2 x ST2000DL003 (Seagate Green Driver 2T) Those two are in mirror using Intel Storage Technology built in the motherboard.

Video Card : Gigabyte GTX460
Sound Card : Sound Blaster XFI Titanium
RAM : 8gb
Pioneer DVD-RW DVR-216D

Onto the problems now:

Since about three weeks now I am having problem with my two seagates waking up from sleep. When accessing the mirror, the first drive start spinning, scratch and seems to stop while the second one do the same pattern. If I'm lucky, RAID woke up and I can access data. If I'm not which seems to be the case most of the time, once second drive start spinning and stoped, the first one start the sequence all over again followed by the second one. This behavior may go as long as I reboot the system and accessing data is difficult.

Second behavior, I think since last week, my activity led is pulsing every second and my main drive never seems to go to sleep while my three others do. This is bugging me deeply as I have no idea what exactly is goign on the system.

There is NO viruses, NO malware. Windows has been reinstalled from scrath on fresh formatted partion. I've tried to boot the system in diagnotstic mode with the same issue. I do not know what is the problem but I find it very unpleasant.

An other test I did, disconnect the RAID entirely and the pulsing continue.

Do anyone of you have any idea of what's going on? Are both problem related somehow? Could it be a windows patch causing all of this as it started not so long ago while is was running perfectly before?

Any tip as to where to search?

Thanks for your help.

Ok, I just found the culprit of my LED heartbeat and I simply can't believe it. It is Soundblaster's drivers for the SoundBlaster XFI Titanium.... ! Reinstalled Windows 7 and added a driver at a time and monitored the led, as soon as I restarted after the soundblaster's drivers I got the issue.

Anyone aware of that?