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This motherboard supports ATA66, ATA100 or ATA133 IDE devices. Following table lists the transfer rate of IDE PIO and DMA
modes. The IDE bus is 16-bit, which means every transfer is two bytes. As the hard drive industry introduces faster and higher
capacity hard drives, the current Ultra ATA/100 interface causes a data bottleneck between the drive and the host computer.
To avoid this problem, hard disk manufacturers have introduced the new Ultra ATA-133 interface technology.
Compared to
traditional ATA/100, ATA/133 has up to 33 percent increase in interface speed with transfer rate of 133MB/s. ATA/133
performance is ideal for new operating systems, such as Window XP, that demand more storage space and faster data transfer
rates from more responsive computing experiences.
To make good use of this new technology and enjoy its best performance, we recommend you to pair your system with a hard
disk equipped with ATA/133 technology so that your system's need for speeding on this motherboard can be satisfied.
Mode Clock Period Clock Count Cycle Time Data Transfer Rate
PIO mode 0 30ns 20 600ns (1/600ns) x 2byte = 3.3MB/s
PIO mode 1 30ns 13 383ns (1/383ns) x 2byte = 5.2MB/s
PIO mode 2 30ns 8 240ns (1/240ns) x 2byte = 8.3MB/s
PIO mode 3 30ns 6 180ns (1/180ns) x 2byte = 11.1MB/s
PIO mode 4 30ns 4 120ns (1/120ns) x 2byte = 16.6MB/s
DMA mode 0 30ns 16 480ns (1/480ns) x 2byte = 4.16MB/s
DMA mode 1 30ns 5 150ns (1/150ns) x 2byte = 13.3MB/s
DMA mode 2 30ns 4 120ns (1/120ns) x 2byte = 16.6MB/s
ATA33 30ns 4 120ns (1/120ns) x 2byte x 2 = 33MB/s
ATA66 30ns 2 60ns (1/60ns) x 2byte x 2 = 66MB/s
ATA100 20ns 2 40ns (1/40ns) x 2byte x 2 = 100MB/s
ATA133 15ns 2 30ns (1/30ns) x 2byte x 2 = 133MB/s