Hard drive cable question -

jludwig wralphie at comcast.net
Thu Feb 23 02:31:33 UTC 2006


On Wednesday 22 February 2006 20:21, Gene Heskett wrote:
> On Wednesday 22 February 2006 19:12, Wolfgang Gill wrote:
> >On Wed, 22 Feb 2006 18:48:24 -0500, bobgoodwin wrote
> >
> >> Does it matter which forty pin connector plugs into the master and
> >> slave drives?
> >>
> >> I have come to the realization after struggling with some problems
> >> that there are a lot more wires in the ribbon cable than there are
> >> connector pins.
> >>
> >> I now see that Maxtor designates the connector at the end of the
> >> cable as the "master" and the one just below it as the "slave."  I
> >> presently have only one drive jumpered as master with FC4 running on
> >> it and it ;doesn't seem to care which data cable connector is
> >> attached to it, but when I put in the second drive, jumpered as
> >> "slave" the computer won't boot.  I decided the drive was bad but
> >> now I'm wondering? It may be the wrong connectors plugged into the
> >> drives.
> >>
> >> I thought "cable select" cables had wires obviously crossed in the
> >> ribbon cable but that may not be true with this 80 wire ribbon?
> >>
> >> Can someone clear this up for me.
> >>
> >> Thanks.
> >>
> >> Bob Goodwin   Zuni, Virginia
> >
> >Nope it doesn't matter. Drive selects are done with jumpers on the
> > drive. All IDE 40/80 pin cables are straight through, so the drive
> > itself govens whether it's master or slave. When I only have one
> > drive, I use the middle connector, and hide the other one out of the
> > way, to give me better casing air flow.
>
> To do so is asking for data errors.  In the IDE system, its assumed that
> the drive jumpered as master will do the termination of the cable also,
> and to do that properly requires that it be on the end of the cable.
> Any cable hanging out the far end of the signal path is an electrical
> mirror, which if not loaded with the cables characteristic impedance
> with an ohmic load, will make the edge of the data signals ring badly,
> possibly corrupting the data.
>
> This is in fact almost as critical as a scsi cable setup, where the
> common practice is to do it right, then sacrifice something to the gods
> just for insurance.
>
> >Usually (Depending on brand of drive), the master drive is jumpered,
> > and the slave drive isn't.
> >
> >Wolf
> >--
> >Open WebMail Project (http://openwebmail.org)
>
> --
> Cheers, Gene
> People having trouble with vz bouncing email to me should add the word
> 'online' between the 'verizon', and the dot which bypasses vz's
> stupid bounce rules.  I do use spamassassin too. :-)
> Yahoo.com and AOL/TW attorneys please note, additions to the above
> message by Gene Heskett are:
> Copyright 2006 by Maurice Eugene Heskett, all rights reserved.
Mine is blue, black, and gray.
Blue to the mother board, black (farthest from mother board), and gray (in the 
middle).
-- 
Some people have convictions.
Some people have opinions
I think I'll have a cheeseburger!




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