From owner-freebsd-scsi@FreeBSD.ORG Mon Oct 10 16:17:20 2005 Return-Path: X-Original-To: scsi@freebsd.org Delivered-To: freebsd-scsi@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 871C116A41F; Mon, 10 Oct 2005 16:17:20 +0000 (GMT) (envelope-from dgilbert@daveg.ca) Received: from ox.eicat.ca (ox.eicat.ca [66.96.30.35]) by mx1.FreeBSD.org (Postfix) with ESMTP id EBBA943D49; Mon, 10 Oct 2005 16:17:19 +0000 (GMT) (envelope-from dgilbert@daveg.ca) Received: by ox.eicat.ca (Postfix, from userid 66) id B5674E740; Mon, 10 Oct 2005 12:17:16 -0400 (EDT) Received: by canoe.dclg.ca (Postfix, from userid 101) id 3DC321A0902; Mon, 10 Oct 2005 12:17:12 -0400 (EDT) From: David Gilbert MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <17226.37896.193503.581827@canoe.dclg.ca> Date: Mon, 10 Oct 2005 12:17:12 -0400 To: "Kenneth D. Merry" In-Reply-To: <20051007120504.GA38496@nargothrond.kdm.org> References: <20051007120504.GA38496@nargothrond.kdm.org> X-Mailer: VM 7.17 under 21.4 (patch 17) "Jumbo Shrimp" XEmacs Lucid Cc: scsi@freebsd.org Subject: Re: 2048kb block size X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Oct 2005 16:17:20 -0000 >>>>> "Kenneth" == Kenneth D Merry writes: Kenneth> On Fri, Oct 07, 2005 at 13:08:05 +0300, Danny Braniss wrote: >> hope this doesn't sound too silly, but can the scsi blcksize be >> set/changed? i know that the 'disk' can be formated to any >> blocksize, the question is does the CAM/da know about non 512 block >> size? Kenneth> CDROM drives often have jumpers to go between 2048 byte and Kenneth> 512 byte blocks. Kenneth> Some hard drives can be formatted for block sizes from 512 to Kenneth> 528 bytes. Anything larger than 512 in that case is used for Kenneth> per-sector ECC information and is typically only used by RAID Kenneth> controllers. Might be interesting to have a geom toy that used 528 byte blocks to do ECC. Dave. -- ============================================================================ |David Gilbert, Independent Contractor. | Two things can only be | |Mail: dave@daveg.ca | equal if and only if they | |http://daveg.ca | are precisely opposite. | =========================================================GLO================