The StarTech.com PCI Ultra ATA/133 Drive controller card supercharges any PC with two 133MB/sec IDE drive ports. The card can act as the primary boot device, and replace built-in IDE ports, or provide an additional 2 high-speed ports to the system. While designed to perform with high-speed ATA/133 drives, the card also supports 100 MB/sec, 66 MB/sec, 33 MB/sec and older hard drives, CD-ROMs, CD-RW drives, and other ATA peripherals. Bus Master drivers are included for DOS, Windows 95, Windows 98, Windows NT4, Windows 2000, and XP.