Sony VPC-Z21X9E hard disk question

Hello,

I've just bought this great laptop: VPC-Z21X9E. I'm very satisfied of the purchase.

I have a question about the hard disk, which is a 256GB SSD hard disk.
If I go into the BIOS I read that there are two disks (raid 0) of 128 GB each, but if I try to boot a Linux live cd distribution and if i do fdisk -l, this is what I get:

Code:

Disk /dev/sda: 128.0 GB, 128035676160 bytes
255 heads, 63 sectors/track, 15566 cylinders, total 250069680 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x68784968

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048    27652095    13825024   27  Hidden NTFS WinRE
/dev/sda2   *    27652096    27856895      102400    7  HPFS/NTFS/exFAT
/dev/sda3        27856896   500127743   236135424    7  HPFS/NTFS/exFAT

Disk /dev/sdb: 128.0 GB, 128035676160 bytes
255 heads, 63 sectors/track, 15566 cylinders, total 250069680 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/sdb doesn't contain a valid partition table

So no RAID is detected by fdisk. Is it a real hardware RAID 0? How many disks are really present?

My problem now is: how should I consider such RAID0? I would like to resize the C windows partition to make free space for a Linux Distribution. How should I do, as regard the disk setup?