From owner-freebsd-hackers@FreeBSD.ORG Fri Jan 13 14:26:26 2006 Return-Path: X-Original-To: freebsd-hackers@freebsd.org Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EF2D616A41F for ; Fri, 13 Jan 2006 14:26:26 +0000 (GMT) (envelope-from stb@lassitu.de) Received: from schlepper.zs64.net (schlepper.zs64.net [212.12.50.230]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5668643D45 for ; Fri, 13 Jan 2006 14:26:25 +0000 (GMT) (envelope-from stb@lassitu.de) Received: from [127.0.0.1] (schlepper [212.12.50.230]) by schlepper.zs64.net (8.13.3/8.12.9) with ESMTP id k0DEQOh2044614; Fri, 13 Jan 2006 15:26:24 +0100 (CET) (envelope-from stb@lassitu.de) In-Reply-To: <20060113132915.GA6848@kukulies.org> References: <200601120948.k0C9mcqR092895@www.kukulies.org> <20060112211300.GB13244@cirb503493.alcatel.com.au> <20060112212337.GA80216@nargothrond.kdm.org> <20060113132915.GA6848@kukulies.org> Mime-Version: 1.0 (Apple Message framework v746.2) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: Content-Transfer-Encoding: 7bit From: Stefan Bethke Date: Fri, 13 Jan 2006 15:26:22 +0100 To: "Christoph P. Kukulies" X-Mailer: Apple Mail (2.746.2) Cc: freebsd-hackers@freebsd.org Subject: Re: increasing dd disk to disk transfer rate X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Jan 2006 14:26:27 -0000 Am 13.01.2006 um 14:29 schrieb Christoph P. Kukulies: > Just for the record: Before I wanted to give back in my faulty disk > to my computer supplier as a case for warranty, I zeroed out the > faulty > disk. > > dd if=/dev/zero of=/dev/ad2 bs=1m > > It took half an hour to zero out the 80GB. Transferrate 44 MB/s? > And not a single error ? Or is this normal? Depending on the model, 44 MB/s seems quite OK. Certainly on the fast side for a 2.5" laptop drive, but not unheard of these days. It is quite possible that the disk controller had a couple of sectors it could not read anymore (and giving I/O errors for them), but was able to reallocate once you wrote to them. I would still ditch the disk, though. Would be interesting to see what the smart reallocated sector count says. Stefan -- Stefan Bethke Fon +49 170 346 0140