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  1. #1
    Uranium Lounger viking33's Avatar
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    Round EIDE Cables

    When I made my last major hardware upgrade, one of the things I included was a set of Round EIDE cables (80 wire), and a round floppy cable. The intent was to improve air flow within the box and also to neaten things up a bit by getting rid of the bulky flat cables. This it really did and the change to round was worth it, I believe.
    I noticed a curious thing about the EIDE cables. They were clearly marked "master & slave" on the connectors. The old flat cables never had any mention of this distinction, and the connectors always could be fitted into the nearest HD and the master/slave jumper was the determining factor as to what was what. (at least that was what I always thought) With the round cables, they were acting like cable select types (CS).? I do know that the flat were just a parallel connection and that was that. There was always a discussion that said this wasn't so, but I never saw any difference.
    Are the round types actually wired different so that the first connector from the mobo is the primary master and the second the secondary slave?
    I guess I will have to swap them around to actually see if it makes any difference, but I thought maybe someone on the forum might know some real facts about this.
    I'm not having any problems with these, just interested in the facts.
    Bob
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  2. #2
    Silver Lounger
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    Re: Round EIDE Cables

    It is my understanding that the designation of Master and Slave on the cables only applies when the jumpers are set to CS. If you do specify Master and Slave with the jumpers then the location on the cable should not matter.

    I think that some cables are marked (with Master/Slave) and others are not (but the same still applies).

    Hope this helps...

  3. #3
    Uranium Lounger viking33's Avatar
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    Re: Round EIDE Cables

    Yes, I agree. I really didn't think it should have made a difference, but at least on the cables I received, there was a good sized tab with the masterslave markings on them. I sure made it seem that if you reversed them they wouldn't work.
    I will do just that the next time I go inside the box for something else and see what happens.
    Thanks for the response.
    Bob
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  4. #4
    Gold Lounger
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    Re: Round EIDE Cables

    I believe that's kerect.

  5. #5
    Uranium Lounger
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    Re: Round EIDE Cables

    I'll jump in too. Cable select is the only time that it will make a difference and it's almost never used. Length is the primary consideration - which is why they're never three feet long, you lose data.
    -Mark

  6. #6
    Uranium Lounger viking33's Avatar
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    Re: Round EIDE Cables

    Two big "atta boys" to everyone!!! I went and swapped the cables around just to make sure and the assumption is correct that it doesn't make any difference what way they are connected as long as the master/slave jumpers are the way you want them. Good information to keep in your knowledge base. I think it goes in the same catagory as the old saw that said that you should always plug your PCI modem into the first slot because of less noise and loss on the data bus because of the shorter length of the the bus copper! <img src=/S/cheers.gif border=0 alt=cheers width=30 height=16>
    Bob
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  7. #7
    3 Star Lounger
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    Re: Round EIDE Cables

    Going back to the CS option, is this EVER used by anyone or is it just a pure legacy thing? Under what circumstances would you do so?

  8. #8
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    Re: Round EIDE Cables

    I have never used it personally. But, from what I have heard from a few people, Compaq tends to use Cable Select on a regular basis in their boxes.
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  9. #9
    Uranium Lounger
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    Re: Round EIDE Cables

    It's used, but rarely, because it's a design oddity. It used to be that you needed a special cable to make use of it. All 80-donductor cables available now should support Cable Select, but you have to watch how you connect the drives. Since Serial ATA is on the horizon I don't expect that it will ever gain widespread use, because Serial ATA addresses many of the shortcomings of IDE drive connections as we now know them (including the 133GB barrier).

    There is an excellent writeup on this topic at PCGuide.com if you're interested.
    -Mark

  10. #10
    Uranium Lounger viking33's Avatar
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    Re: Round EIDE Cables

    I have worked on a few HP's that asked for CS, why I don't know!
    BOB
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