Serial ATA (or SATA) has been designed as a replacement for the existing 40 way IDE cable the SATA connector and cable are smaller (which improves air circulation) with a reduced operating voltage and pin amount (7 as opposed to 40) the current data transfer rate is ATA- 150 (1.5Gbps). Each connected SATA device or conversion needs its own cable this removes the old master/slave set-up and allows for improved data transmission and access speed. The SATA PCI Cards are compliant with Serial ATA 1.0 specifications to upgrade your desktop computer to allow Dual Serial ATA RAID Channels and one Parallel ATA (IDE) Host controller to support up to two devices. The PCI Cards provide two fully compliant Serial ATA ports to access Striping (RAID 0) and Mirroring (RAID 1) are supported to improve data performance and provide data redundancy. Specification Serial ATA - 1.5 Gbps (150 MB/s) Compliant with Serial ATA 1.0 Specification Supports 48-bit LBA (Large Disk) hard drives larger than 137 GB Supports spread spectrum clocking to reduce EMI Registers as compatible with Parallel ATA Single digital PLL architecture with 1 PLL for both channels Serial ATA Interface Supports SATA 1.0 (High Speed Serialised AT Attachment Revision 1.0) 1.5 Gb/s data rate Completely software transparent with Parallel ATA Supports Host adaptor register Interface (SCR Status and Control Registers) Supports 48-bit LBA (Large Disk) hard drives larger than 137 GB Parallel ATA Interface Supports Ultra DMA Mode transfers up to Mode 6 Timing (133 Mbytes/sec) Supports 48-bit LBA (Large Disk) hard drives larger than 137 GB Supports PIO Modes up to Mode 4 Timings and Multiword DMA Mode 012 with Independent Timing of up to 2 drives Supports Tri-State IDE Signals ALI Chipset