Windows Experience Index, and primary HDD rating

[Trillionsin]

My scores are as such:

Processor: 7.5
Memory (RAM): 7.5
Graphics: 7.4
Gaming Graphics: 7.4
Primary hard disk: 5.9

I have SATA HDDs in my computer. Does anyone know how I can increase this rate if it is indeed slow? Or is this average? Any information or possibly a LMGTFY.. lol any pointers here accepted. Much appreciation in advance!

More information if it helps:
Asus P6T Deluxe V2 motherboard
I have 4 HDDs set up. Two are in RAID0 setup. The rest have no RAID setup.

 

[cliffordcooley]

5.9 is top of the line for platter drives that are not in a raid configuration.

 

[Trillionsin]

5.9 is top of the line for platter drives that are not in a raid configuration.

Okay, so in other words could you say that an SSD would give me a higher number, or rather more importantly higher transfer speeds?