From owner-freebsd-chat Thu Nov 6 21:13:27 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id VAA10639 for chat-outgoing; Thu, 6 Nov 1997 21:13:27 -0800 (PST) (envelope-from owner-freebsd-chat) Received: from dyson.iquest.net (dyson.iquest.net [198.70.144.127]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id VAA10632 for ; Thu, 6 Nov 1997 21:13:20 -0800 (PST) (envelope-from toor@dyson.iquest.net) Received: (from root@localhost) by dyson.iquest.net (8.8.7/8.8.5) id AAA00623; Fri, 7 Nov 1997 00:13:05 -0500 (EST) From: "John S. Dyson" Message-Id: <199711070513.AAA00623@dyson.iquest.net> Subject: Re: hardware In-Reply-To: <199711070451.VAA24465@obie.softweyr.ml.org> from Wes Peters at "Nov 6, 97 09:51:28 pm" To: softweyr@xmission.com (Wes Peters) Date: Fri, 7 Nov 1997 00:13:05 -0500 (EST) Cc: bob@luke.pmr.com, chat@FreeBSD.ORG, mike@smith.net.au, cgull@smoke.marlboro.vt.us Reply-To: dyson@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL31 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-chat@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Wes Peters said: > > I just bought a Samsung 3.4 Gb drive with these features for my wife's > machine, which runs Win95 and WinNT both. The drive is fast and quiet, > and judging from the Samsungs we have scattered around at work, > reliable. I suppose it is the "mode 4" that gives us the equivalents of > detach and command queueing, Mr. Smith? > I'll answer the question -- mode 4 is a fairly fast PIO mode. It is not desirable to use esp. on a PPro. You really want to use mode 2 DMA or Ultra DMA. My guess is that simple command setup for DMA on an IDE drive is faster than an equiv SCSI system. In fact, the command overhead of recent IDE drives is very impressively low. (For SCSI advocates -- I don't mean to imply that IDE is better than SCSI, only that it is getting surprisingly good, for such a low-end technology.) -- John dyson@freebsd.org jdyson@nc.com