From owner-freebsd-hardware Wed Jan 12 14:56:10 2000 Delivered-To: freebsd-hardware@freebsd.org Received: from verdi.nethelp.no (verdi.nethelp.no [158.36.41.162]) by hub.freebsd.org (Postfix) with SMTP id 6D42714F9B for ; Wed, 12 Jan 2000 14:56:04 -0800 (PST) (envelope-from sthaug@nethelp.no) Received: (qmail 72220 invoked by uid 1001); 12 Jan 2000 22:55:59 +0000 (GMT) To: grios@ddsecurity.com.br Cc: ohoyer@fbwi.fh-wilhelmshaven.de, freebsd-hardware@FreeBSD.ORG Subject: Re: hardware From: sthaug@nethelp.no In-Reply-To: Your message of "Wed, 12 Jan 2000 20:42:28 -0200" References: <387D0354.63159B8@ddsecurity.com.br> X-Mailer: Mew version 1.05+ on Emacs 19.34.2 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Date: Wed, 12 Jan 2000 23:55:59 +0100 Message-ID: <72218.947717759@verdi.nethelp.no> Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > So i cannot understand, take a closer look: > http://www.seagate.com/cda/products/discsales/marketing/detail/0,1121,43,00.shtml > > May anyone here explain me this ? As far as I can see, Seagate's specifications are somewhat conflicting, or at the very least unclear. I'm looking at the "Performance" table from http://www.seagate.com/cda/products/discsales/enterprise/tech/0,1131,43,00.shtml Yes, it says "External (I/O) Transfer Rate (max) 80 MBytes/sec" - but this is worthless since it obviously means transfer from the cache. The number which is interesting is *sustained* transfer rate, at the outer and inner part of the disk. (Compare with "Internal Transfer Rate (max) 264 Mbits/sec" - you'd need an internal transfer rate of more than 640 Mbits/s to get a sustained 80 MB/s from the outer part of the disk.) Even so, an *average* formatted transfer rate of 22.5 MB/s is rather good! Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message