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View Full Version : UDMA ribbon cable vs standard IDE? Is there such a thing?



Jalapino
02-21-00, 09:38 PM
I thought I had read somewhere that there is a difference between the standard IDE cable and one use for UDMA drives. Is there such a cable and is so what are the difference? LIke is there 80 wires but 40pins, so they look the same or what? Thanks in advance!

Fixxer
02-21-00, 10:54 PM
I think you might be thinkin of ATA/66 cables.. then again you might not be http://www.speedguide.net/ubb/biggrin.gif

LikeAGlove
02-21-00, 11:02 PM
i was wondering the same thing. http://www.speedguide.net/ubb/confused.gif

i've heard something to the effect of what Fixer is talking about, but wrt UDMA/33, the jury is still out for me.

i had to do a lot of digging to find out how to enable and optimise DMA for NT4. i did it with the normal 40-pin cables.

therefore, according to what i understand, 80-pin are not required for udma/33, but rather some other purpose (maybe special purpose mobos)

just my $.02 (discounted because of the weakness of our currency) http://www.speedguide.net/ubb/biggrin.gif

glove

Jalapino
02-21-00, 11:40 PM
Actually you are right Fixxer, that is what I think I am talking about. I just wanted to make sure I was right. There is such a thing right? I believe you need to use a as you call "ATA 66" cable to get the drive to use bandwith of the 66mhz bus right? You can use a standard IDE cable but wont you only achieve regular hard drive speeds? I assume the extra 40 wires in the 80 wire total help you double the bandwith going to and from, but I am not full sure about this. PLease help me understand if I am right or wrong. Thanks again!! Like I said I am not fully sure.



[This message has been edited by Jalapino (edited 02-22-2000).]

Hell_Yes
02-22-00, 10:44 PM
As I understand it, The "extra wires" help eliminate cross-talk. At high speeds inductance can be a problem

David

Jalapino
02-23-00, 12:19 AM
So back to my original question is there a different cable to use for UDMA drives other than the standard IDE cable? Like we have talked about earlier in the post?

Bouncer
02-23-00, 09:31 AM
Yes.

ATA/66 cables have an 80 pin layout to minimise crosstalk, which is the only way to move beyond ATA/33.

reference:

https://www.ultracable.com/atas_faqs.html

Regards,
-Bouncer-

------------------
"Yeah Baby, YEAH!!!"

Jalapino
02-23-00, 10:26 AM
Thank you very much! That is exactly the info I have been looking for!