Difference between Primary and Secondary IDE Channels?

Is there any difference between the primary and secondary IDE channels? I
have my harddrive on secondary and my DVD 16X burner on primary. I tried
this because when I put my DVD burner on secondary it would only get
Multi-Word DMA mode 2 while the HDD got UDMA mode 5 on the primary. This is
a new burner and capable of UDMA 4. After troubleshooting I switched
channels and got UDMA mode 4 on the DVD burner when on the primary as master
and still got UDMA mode 5 on the only HDD on the secondary as master. I
don't understand the difference and the computer works fine and it appears I
am getting the transfer modes I am supposed to.


.

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