80-conductor IDE cables with UDMA-33 devices

vbimport

#1

Is there any advantage or disadvantage to using 80-conductor cables with UDMA-33 devices (for example a DVD-ROM and a CD-RW both on secondary IDE channel and both support UDMA-33)?

I realize that it isn't necessary to use 80-conductor cables unless you're using UDMA-66 or faster devices, but I was just curious as to what effect it might have.


#2

No it will not hurt anything.

Quick lesson in “wire science” when wires that are laid next to each other transfer date/electricity they get “cross talk” actually it creates a electro-magnetic field. This will create errors in data transfer.

So they inserted a “dummy” wire that was just grounded out. This neutral wire would buffer out cross talk by absorbing the noise.

Here is an exerpt from www.HowStuffWorks.com
http://www.howstuffworks.com/ide2.htm

Ultra DMA increased the DMA transfer rate from ATA-2’s 16.67 MB/sec to 33.33 MB/sec. In addition to the existing cable that uses 40 pins and 40 conductors (wires), this version introduces a cable that has 80 conductors. The other 40 conductors are ground wires interspersed between the standard 40 conductors to improve signal quality. ATA-4 is also known as Ultra DMA, Ultra ATA and Ultra ATA/33.

ATA-5: The major update in ATA-5 is auto detection of which cable is used: the 40-conductor or 80-conductor version. Ultra DMA is increased to 66.67 MB/sec with the use of the 80-conductor cable. ATA-5 is also called Ultra ATA/66.

So in short: No it won’t hurt anything, if anything it could improve performance. But I doubt it.

:eek:


#3

It doesn’t hurt, theoreticly it might boost performance. The signal will be cleaner anyway.