From owner-freebsd-fs Mon Nov 1 13:28:49 1999 Delivered-To: freebsd-fs@freebsd.org Received: from smtp05.primenet.com (smtp05.primenet.com [206.165.6.135]) by hub.freebsd.org (Postfix) with ESMTP id 2611F14E2A for ; Mon, 1 Nov 1999 13:28:29 -0800 (PST) (envelope-from tlambert@usr02.primenet.com) Received: (from daemon@localhost) by smtp05.primenet.com (8.9.1/8.9.1) id OAA46230; Mon, 1 Nov 1999 14:28:18 -0700 Received: from usr02.primenet.com(206.165.6.202) via SMTP by smtp05.primenet.com, id smtpdCtTf7a; Mon Nov 1 14:28:14 1999 Received: (from tlambert@localhost) by usr02.primenet.com (8.8.5/8.8.5) id OAA03945; Mon, 1 Nov 1999 14:28:11 -0700 (MST) From: Terry Lambert Message-Id: <199911012128.OAA03945@usr02.primenet.com> Subject: Re: Journaling To: bde@zeta.org.au (Bruce Evans) Date: Mon, 1 Nov 1999 21:28:11 +0000 (GMT) Cc: Brendon_Meyer@fmi.com, grog@lemis.com, freebsd-fs@FreeBSD.ORG In-Reply-To: from "Bruce Evans" at Oct 30, 99 04:18:12 pm X-Mailer: ELM [version 2.4 PL25] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > The supply of 'FDISK' style slices is essentially unlimited. I believe the > limit is 2G or 4G slices for the 'FDISK' (extended) data structure. FreeBSD > drivers only support the first 30 and FreeBSD fdisk only supports the first 4. The slice size limit is based on the 8G overall limit on a partition in which you can place an extended partition. In actual fact, the DOS partition table has a 32 bit alternate size field, which is the count of sectors in the partition, that is supposed to be used when the C/H/S values are all set to zero; clearly, it breaks some backward compatability, when used. This puts the upper bound on a single partition at ~1TB, and the offset is the same, so you should be able to map an ~2TB disk in two partitions using FDISK partitioning. The only caveat is that you won't be able to share the disk with older versions of DOS and Windows, unless you put a smaller partition of standard C/H/S values up front. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message