XPS 8500 files transfer rate is slow

Hi,

I have just bought a XPS 8500 last week. Everything seems to be fine except the File Transfer rate is quite slow. When copying a large number of files from one partition to another (C to D drive) it is averaging 20 - 30 MB/s. When I try to copy the same amount of files within the same partition (C Drive) it is averaging 80 - 100 MB/s. This is worst than my Win 7 laptop.

In my Windows System information page, the Windows Experience Index is showing the Primaary hard disk: Disk data transfer rate is on 5.9 which is quite slow.

I was wondering has anyone else experiencing similar data transfer rate issue with their XPS systems?

Here is my system summary:

Product XPS 8500
BIOS Version String A06

Operating System
Name Microsoft Windows 7 Home Premium Edition (64-bit)
Service Pack Service Pack 1
Build Number 7601
DirectX Version 11

Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz (CPU:0)
Name Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
Cores 4
Threads 8

System Memory
Total Physical Memory 12.00 GB
Maximum Supported Memory 32.00 GB

Hard Drive - 1W0EYZXJ
Model Number Intel Raid 0 Volume
Firmware Revision 1.0.

Hard Drive - ST2000DM001-9YN164
Vendor Seagate
Model Number ST2000DM001-9YN164
Firmware Revision CC4G
Marketed Size 2 TB

Hard Drive - SAMSUNG SSD PM830 mSATA 32GB
Vendor Samsung
Model Number SAMSUNG SSD PM830 mSATA 32GB
Firmware Revision CXM12D1Q
Marketed Size 32 GB

Windows Experience Index 
Base Score 5.9
Processor Subscore 7.7
Memory (RAM) Subscore 7.8
Graphics (Aero) Subscore 7.6
Gaming Graphics Subscore 7.6
Primary Disk Subscore 5.9
Assessment State Valid Scores
Assessment Date 2/09/2012 2:28:04 PM