From owner-freebsd-questions Wed Apr 17 22:19:07 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id WAA14776 for questions-outgoing; Wed, 17 Apr 1996 22:19:07 -0700 (PDT) Received: from DGS.dgsys.com (root@dgs.dgsys.com [204.97.64.1]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id WAA14759 for ; Wed, 17 Apr 1996 22:19:05 -0700 (PDT) Received: from justine.elastica.com by DGS.dgsys.com (5.0/SMI-SVR4) id AA28982; Thu, 18 Apr 1996 01:16:01 -0400 Received: (from robert@localhost) by justine.elastica.com (8.7.5/8.7.3) id BAA01321; Thu, 18 Apr 1996 01:15:57 -0400 (EDT) Newsgroups: comp.periphs.scsi Subject: Help extended translation confusion. Cc: questions@freebsd.org From: robert@elastica.com (Robert Nicholson) Date: 18 Apr 1996 01:15:54 -0400 Message-Id: Organization: x Lines: 30 X-Newsreader: September Gnus v0.41/Emacs 19.30 Posted-To: comp.periphs.scsi Sender: owner-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk [courtesy cc of this posting sent to cited author via email] Hi, I've read all about how Adaptec controllers do extended translation and I think I understand what's going on. But I'm really confused by what is happening with my DTC 3130B (NCR 815) and my Quantum Atlas 4 GIG drive. When using FreeBSD's fdisk the geometry is reported as 1017 cylinders, 131 heads and 63 sectors. Now this translates to 4GIG with 512 byte blocks. So, why can I not currently boot any OS that is above 1GIG? The controller appears to be doing translation already since it can address the whole 4GIG within 1017 cylinders. but every OS I've tried to boot above around the 1GIG mark fails. The geometry is reported from the disk label right after it was lowlevel formatted? Could the DTC being performing an entirely different translation factor on top of what the drive's been low leveled format as? ie. the DTC ignores the disklabel and performs it's own translation probably using 64 heads and consequently only addressing 1GIG in the first 1024 cylinders? Signed confused. -- "Under the circumstances I will sit down." (PGP key: send email with Subject: request pgp key)