Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262932AbUDYELw (ORCPT ); Sun, 25 Apr 2004 00:11:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262930AbUDYELv (ORCPT ); Sun, 25 Apr 2004 00:11:51 -0400 Received: from inti.inf.utfsm.cl ([200.1.21.155]:50629 "EHLO inti.inf.utfsm.cl") by vger.kernel.org with ESMTP id S262906AbUDYELA (ORCPT ); Sun, 25 Apr 2004 00:11:00 -0400 Message-Id: <200404240128.i3O1SrlP002787@pincoya.inf.utfsm.cl> To: Timothy Miller Cc: Linux Kernel Mailing List Subject: Re: File system compression, not at the block layer In-Reply-To: Your message of "Fri, 23 Apr 2004 17:18:44 -0400." <40898834.7040803@techsource.com> X-Mailer: MH-E 7.4.2; nmh 1.0.4; XEmacs 21.4 (patch 14) Date: Fri, 23 Apr 2004 21:28:53 -0400 From: Horst von Brand Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 964 Lines: 22 Timothy Miller said: [...] > In a drive with multiple platters and therefore multiple heads, you > could read/write from all heads simultaneously. Or is that how they > already do it? No. Current disks have bad blocks (way too small on disk to be able to ensure 100% OK), and they are remapped by the drive firmware to spare cilinders. To have the exact same blocks broken on each surface would be a real lottery. -- Dr. Horst H. von Brand User #22616 counter.li.org Departamento de Informatica Fono: +56 32 654431 Universidad Tecnica Federico Santa Maria +56 32 654239 Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/