From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 20 Jun 2001 14:35:02 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 20 Jun 2001 14:34:53 -0400 Received: from mailhost.tue.nl ([131.155.2.5]:37145 "EHLO mailhost.tue.nl") by vger.kernel.org with ESMTP id ; Wed, 20 Jun 2001 14:34:41 -0400 Message-ID: <20010620203444.A22204@win.tue.nl> Date: Wed, 20 Jun 2001 20:34:44 +0200 From: Guest section DW To: Josh Fryman , linux-kernel@vger.kernel.org Subject: Re: IDE drives mis-reporting size... bug or feature? In-Reply-To: <3B30E4CC.3794331@cc.gatech.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93i In-Reply-To: <3B30E4CC.3794331@cc.gatech.edu>; from Josh Fryman on Wed, Jun 20, 2001 at 02:00:44PM -0400 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 20, 2001 at 02:00:44PM -0400, Josh Fryman wrote: > this is an odd one. i think it's technically a feature > but might be perceived instead as a "bug". anyway, i've > got a pair of Ultra100 Maxtor 52049h4 20GB drives, on a > Promise Ultra 100 (PDC20267) controller. > > the drives were popped in with the jumper on for the > 4096 cylinder limit forced. > > the promise controller recognizes the drives on boot-up > init as being what they are - ~20GB - and continues on > merrily. > > Windows 2000 recognizes the drives as ~2GB in size, due to > the jumper. it's observing the 4096cyl limit on the drive > in some way. (remove the jumper and it sees ~20GB too.) > > Linux 2.4.3 recognizes the drives as ~20GB regardless of > the jumper. > > so, is this a bug or feature? is windows or linux not > working right here? what *should* be seen with the drive > jumpered such? The jumper is to overcome a BIOS defect. The operating system should see the true size. In order to get Windows to see the true size you may need MaxBlast or similar boot manager stuff.