Date: Fri, 11 Aug 2000 15:17:33 -0500 From: "Shawn Barnhart" <swb@grasslake.net> To: <freebsd-hardware@FreeBSD.ORG> Subject: Re: Best behaved drives for FreeBSD? Message-ID: <00ef01c003d1$2f3710c0$b8209fc0@marlowe> References: <Pine.BSF.4.21.0008111123340.59633-100000@mail.wolves.k12.mo.us> <00d301c003b9$2d425990$b8209fc0@marlowe> <011a01c003ce$6d48ae80$c8026b83@wrath01>
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----- Original Message -----
From: "Brian" <wrath@shianet.org>
To: <freebsd-hardware@FreeBSD.ORG>
Sent: Friday, August 11, 2000 14:57
Subject: Re: Best behaved drives for FreeBSD?
| All of them run to ground through your board, to the power supply, out
the
| cable, into the receptacle, down the line, through the breaker panel,
and
| down to a ten foot ground rod in the ground. Of course there's dozens
of
| ways of grounding, but more than likely it goes to a ground rod or to
the
| STREET side of your water pipe from the city.
|
| It won't do you much good if you're one of those people that cut off
the
| grounding terminal on your power supply cord to fit your pre-1970's
| receptacle.
|
| If you sat there with your ohmmeter you'd probably find that all those
wires
| (40 of them) go to one of the many ground wires on the cable.
|
| It's a great idea to use ground shielding to _help_ eliminate
crosstalk, but
| whoever decided to use 24 gauge (I've even seen 30 gauge) wire with
even
| thinner PVC coating (to keep the already giant ribbon from growing to
fill
| your 1U case) should be hung from their toes.
|
| until they get a hillbilly electrician on the standards committee,
it's
| going to get worse. next thing you'll know they'll start using solid
| aluminum wire.
|
| Brian St.John
| brian@wrath.com
| "the only eighteen year old nerd that doesn't run eunicks at home"
|
| ----- Original Message -----
| From: "Shawn Barnhart" <swb@grasslake.net>
| To: "FreeBSD Hardware List" <freebsd-hardware@FreeBSD.ORG>
| Sent: Friday, August 11, 2000 1:25 PM
| Subject: Re: Best behaved drives for FreeBSD?
|
|
| > Can someone explain to me the technical advantages of tying all the
| > ground lines together at the cable connectors ("40 pin
compatibility")
| > but breaking them off seperately for the rest of the cable ("80 wire
| > cable")?
| >
| > It strikes me that if you're doing ground isolation to keep noise at
bay
| > that tying the grounds together anywhere along the cable run would
| > defeat the purpose.
| >
| > To me this makes no sense, but I'm not an eletrical engineer,
either.
| >
| >
| >
| >
| > To Unsubscribe: send mail to majordomo@FreeBSD.org
| > with "unsubscribe freebsd-hardware" in the body of the message
| >
|
|
|
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|
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