From owner-freebsd-questions@FreeBSD.ORG Mon Aug 22 20:13:36 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 F287716A420 for ; Mon, 22 Aug 2005 20:13:35 +0000 (GMT) (envelope-from sp.ibm@gmx.de) Received: from mail.gmx.net (mail.gmx.de [213.165.64.20]) by mx1.FreeBSD.org (Postfix) with SMTP id 3678443D45 for ; Mon, 22 Aug 2005 20:13:34 +0000 (GMT) (envelope-from sp.ibm@gmx.de) Received: (qmail invoked by alias); 22 Aug 2005 20:13:33 -0000 Received: from p85.212.15.184.tisdip.tiscali.de (EHLO monster) [85.212.15.184] by mail.gmx.net (mp002) with SMTP; 22 Aug 2005 22:13:33 +0200 X-Authenticated: #832750 Message-ID: <007301c5a755$ea1ee840$6701a8c0@monster> From: "Sebastian Pahlke" To: Date: Mon, 22 Aug 2005 22:13:07 +0200 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2670 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670 X-RFC2646: Format=Flowed; Original X-Y-GMX-Trusted: 0 Subject: dd is so slow on my SCSI disc 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: Mon, 22 Aug 2005 20:13:36 -0000 Hi all, I'm trying to "clean" a disc before selling them: dd if=/dev/zero of=/dev/da0 Do I make something wrong because the transfer rate is only 60932 bytes/sec??? These are 60 kbytes/sec, slower than my internet connection!!! :( I tried to increase the block size, with bs=32768 I get 3416071 bytes/sec. But this is still very poor. The system is a PIII 800MHz and a SCSI-3 disc in single user mode booted from FreeBSD release 5.4 live-cd. Any ideas how to analyze this? Thanks in advance! greetings, Sebastian Pahlke