From owner-freebsd-hackers Thu May 15 13:43:58 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id NAA13806 for hackers-outgoing; Thu, 15 May 1997 13:43:58 -0700 (PDT) Received: from seagull.rtd.com (seagull.rtd.com [198.102.68.2]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id NAA13800 for ; Thu, 15 May 1997 13:43:56 -0700 (PDT) Received: (from dgy@localhost) by seagull.rtd.com (8.7.5/8.7.3) id NAA01540 for freebsd-hackers@freefall.cdrom.com; Thu, 15 May 1997 13:43:56 -0700 (MST) From: Don Yuniskis Message-Id: <199705152043.NAA01540@seagull.rtd.com> Subject: disklabel and disktab To: freebsd-hackers@freefall.FreeBSD.org (FreeBSD hackers) Date: Thu, 15 May 1997 13:43:55 -0700 (MST) X-Mailer: ELM [version 2.4 PL24] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Greetings! Apparently, one complete track is set aside at the start of the disk (for "compatibility with other OS's"??). It appears that this is *only* a track and NOT a complete cylinder. The disktab entry reflects this in the size of the 'c' partition (i.e. being exactly one track's worth of sectors smaller than the *actual* size of the disk). But, I can't see where the "missing sectors" are accounted for -- i.e. why aren't any of the "offset" parameters set to reflect this "one track worth of sectors"?? Also, is there any particular advantage to *where* the swap (or any other partition) happen to be physically located on the disk? I imagine the *ideal* would be to locate the swap in the center of the media (?) -- assuming sectors correlate with physical locations... Lastly, aren't the actual geometry related parameters for the disktab "meaningless" for SCSI devices? Thanx! --don