From owner-freebsd-hardware Fri Aug 11 13:16:50 2000 Delivered-To: freebsd-hardware@freebsd.org Received: from accord.grasslake.net (accord.grasslake.net [206.11.249.240]) by hub.freebsd.org (Postfix) with ESMTP id C4F9237C1DB for ; Fri, 11 Aug 2000 13:16:44 -0700 (PDT) (envelope-from swb@grasslake.net) Received: from marlowe (Marlowe.campbell-mithun.com [192.159.32.184]) by accord.grasslake.net (8.9.3/8.9.3) with SMTP id PAA02549 for ; Fri, 11 Aug 2000 15:17:52 -0500 (CDT) (envelope-from swb@grasslake.net) Message-ID: <00ef01c003d1$2f3710c0$b8209fc0@marlowe> From: "Shawn Barnhart" To: References: <00d301c003b9$2d425990$b8209fc0@marlowe> <011a01c003ce$6d48ae80$c8026b83@wrath01> Subject: Re: Best behaved drives for FreeBSD? Date: Fri, 11 Aug 2000 15:17:33 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.3018.1300 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.3018.1300 Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org ----- Original Message ----- From: "Brian" To: 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" | To: "FreeBSD Hardware List" | 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 | > | | | | To Unsubscribe: send mail to majordomo@FreeBSD.org | with "unsubscribe freebsd-hardware" in the body of the message | To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message