From owner-freebsd-questions Tue Mar 4 21:58:31 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id VAA25619 for questions-outgoing; Tue, 4 Mar 1997 21:58:31 -0800 (PST) Received: from dyson.iquest.net (dyson.iquest.net [198.70.144.127]) by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id VAA25611 for ; Tue, 4 Mar 1997 21:58:26 -0800 (PST) Received: (from root@localhost) by dyson.iquest.net (8.8.4/8.6.9) id AAA27805; Wed, 5 Mar 1997 00:58:16 -0500 (EST) From: "John S. Dyson" Message-Id: <199703050558.AAA27805@dyson.iquest.net> Subject: Re: (DOS) Partition Size / Cluster Size. To: ROBERTC@PII.COM (Robert Clark) Date: Wed, 5 Mar 1997 00:58:16 -0500 (EST) Cc: freebsd-questions@freebsd.org In-Reply-To: from "Robert Clark" at Mar 4, 97 04:07:30 pm X-Mailer: ELM [version 2.4 PL24 ME8] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > > (DOS) > Partition Size Cluster Size > 1-31MB 512bytes > 32-63MB 1k > 64-127MB 2k > 128-255MB 4k > 256-511MB 8k > 512-1023MB 16k > 1024-2047MB 32k > > If you use FIPS to shrink a > partition, don't cross a boundary > above? > I don't know what you are really asking, but on FreeBSD V2.1.X DO NOT use a DOS filesystem that has a cluster size of greater than 16K. If you shrink a filesystem with FIPS, you'll not shrink the cluster size, and will still have problems if the cluster size is greater than 16K. Anecdote: I just tried to install FreeBSD from a DOS partition today. (It was 2.1.6). It wouldn't install properly. Found out that the DOS partition was 1.6GB!!! We rebuilt the disk so that it had a 500MB partition (from scratch, not using FIPS), and the install went fine. So, don't even mount a DOS FS with cluster size of greater than 16K read-only -- if you do, you will be placing the rest of your filesystems at risk. FreeBSD V2.2 apparently has the problem fixed. John dyson@freebsd.org