Sabrent Silicon Image Raid Native SERIAL ATA (SATA-150) 4 PORTS Low Profile PCI Controller Host Card Adapter (SBT-SRD4) Upgrade your desktop computer to have four SATA RAID channels Supports low profile PCI and regular size PCI Provides a 32 bit, 33/66MHz PCI interface on the host side Dual, fully compliant Serial ATA ports on the device side RAID 0, RAID 1, RAID 0+1 and RAID 1+S improve the data performance and provide the data redundancy and rebuilding