Sony VGC-RA825GY - Manual (Page 86)

A RAID Overview
If you have purchased a configure-to-order (CTO) VAIO ® computer with one of the following options:
 RAID-0 —Your computer is configured for RAID-0 and has two or more preinstalled S-ATA hard disk drives.
 RAID-ready —Your computer has RAID capability and requires you to install one or more S-ATA hard disk drives.
In either situation, you can:
 Install and configure hard disk drives for RAID-0 or RAID-1.
 Change the existing RAID configuration to RAID-0 or RAID-1.
 Remove the RAID configuration completely.
Your VAIO computer's drive bay can accommodate a total of four S-ATA hard disk drives. If you are installing your own
equipment, Sony suggests using hard disk drives that are identical in size and manufacture.
Page 86