用數的應該算的出來

http://www.intel.com/support/platfo...ium4/ata100.htm

DMA Transfer Modes Data Transfer Rate (max.) Cable Conductors CRC
DMA Mode 1 11.1 MB/s 40-pin IDE 40-pin No
Multi-word DMA Mode 1 13.3 MB/s 40-pin IDE 40-pin No
Multi-word DMA Mode 2 16.6 MB/s 40-pin IDE 40-pin No
Ultra ATA Mode 2 33.3 MB/s 40-pin IDE 40-pin Yes
Ultra ATA Mode 3 44.4 MB/s 40-pin IDE 80-pin Yes
Ultra ATA Mode 4 66.6 MB/s 40-pin IDE 80-pin Yes
Ultra ATA Mode 5 100 MB/s 40-pin IDE 80-pin Yes