RAID-1 loading folders slow?

[Empty_Quarter]

I have two 1TB WD RE3 drives set-up in RAID-1 on ICH9R. I have had this setup for a while now and I notice that everytime I access the drive, it takes quite a while for all the folders to load, i'd say about 3-4 seconds. It's as if the drive needs to initiate everytime I access it. Once I get in though, I can browse around the drive quickly and easily. Whats the reason for this? It finally got to me and I would definately like to get it fixed.

My drives seem fine and I have 2x Raptor-X in RAID-0 on the SB as well.

Any ideas?