As the hard drive industry introduces faster and higher capacity hard drives, the current Ultra ATA100 interface causes a data bottleneck between the drive and the host computer.

To avoid the problem, hard disk manufactures have introduced the new Ultra ATA-133 interface technology with data transfer rates up to 133 MB/sec.

Some of AOpen's motherboards have been equipped with ATA-133 interface. AOpen recommends you to pair your system with the hard disk equipped with ATA-133 technology to get the best performance of the new motherboards and to satisfy your system's need for speed.

Mode	Clock Period	Clock Count	Cycle Time	Data Transfer Rate
ATA 33	30ns	4	120ns	(1/120ns) x 2byte x 2 = 33MB/s
ATA 66	30ns	2	60ns	(1/60ns) x 2byte x 2 = 66MB/s
ATA 100	20ns	2	40ns	(1/40ns) x 2byte x 2 = 100MB/s
ATA 133	15ns	2	30ns	(1/30ns) x 2byte x 2 = 133MB/s