From owner-freebsd-questions@FreeBSD.ORG Sun Jun 5 19:58:47 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 972AD16A41C for ; Sun, 5 Jun 2005 19:58:47 +0000 (GMT) (envelope-from jpp@cloudview.com) Received: from skipjack.no-such-agency.net (skipjack.no-such-agency.net [64.142.114.146]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6713F43D1F for ; Sun, 5 Jun 2005 19:58:47 +0000 (GMT) (envelope-from jpp@cloudview.com) Received: from skipjack.no-such-agency.net (localhost [127.0.0.1]) by skipjack.no-such-agency.net (Postfix) with ESMTP id E37FD34D435; Sun, 5 Jun 2005 12:58:44 -0700 (PDT) Received: from [192.168.2.120] (blackhole.no-such-agency.net [64.142.103.196]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by skipjack.no-such-agency.net (Postfix) with ESMTP id 3AD0534D415; Sun, 5 Jun 2005 12:58:42 -0700 (PDT) Message-ID: <42A35971.9030101@cloudview.com> Date: Sun, 05 Jun 2005 12:58:41 -0700 From: John Pettitt User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317) X-Accept-Language: en-us, en MIME-Version: 1.0 To: "D. Goss" References: <3A0E3262-4941-48F5-9532-5E45359690F1@dylangoss.com> In-Reply-To: <3A0E3262-4941-48F5-9532-5E45359690F1@dylangoss.com> X-Enigmail-Version: 0.91.0.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-AV-Checked: by skipjack Cc: freebsd-questions@freebsd.org Subject: Re: 36.4GB drive formats out to 32.8GB? what am I missing please X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 05 Jun 2005 19:58:47 -0000 D. Goss wrote: > I am adding some drives to an IBM xSeries 345. I recently picked up > (via eBay) an IBM packaged Seagate drive, all with the proper IBM > part numbers as: > > U320 15k > 36.4GB formatted capacity > (IBM part 06P5776 / 06P5778, with Seagate drive ST336753LC) > > Looking up both the IBM part numbers and the Seagate part numbers via > Google, I consistantly get that the drive's formatted capacity is > 36.4GB. > > When partitioned either in "safe" or "dd" mode (via sysinstall) and > set to use the entire disk as one slice, once the drive is mounted I > show: > > # df -m > /dev/da1s1 33617 0 30928 0% /misc > > # df -h > /dev/da1s1 33G 4.0K 30G 0% /misc > > I'm seeing approx. 30,600MB (32.8GB?) free - > > I suspect three things are goping on 1) disk makers specify GB as 1,000,000,000 bytes but everybody else specifies 1,073,741,824 bytes (1024*1024*1024) this will yeild 33.9 GB from your 36.4 GB drive 2) formatting itself takes some space for superblocks etc 3) some psace is reserved (man newfs and tunefs for info) John