From owner-freebsd-scsi Thu May 23 14:34:07 1996 Return-Path: owner-freebsd-scsi Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id OAA22717 for freebsd-scsi-outgoing; Thu, 23 May 1996 14:34:07 -0700 (PDT) Received: from irz301.inf.tu-dresden.de (irz301.inf.tu-dresden.de [141.76.1.11]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id OAA21685 for ; Thu, 23 May 1996 14:28:18 -0700 (PDT) Received: from sax.sax.de by irz301.inf.tu-dresden.de (8.6.12/8.6.12-s1) with ESMTP id XAA11047; Thu, 23 May 1996 23:27:50 +0200 Received: by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id XAA11599; Thu, 23 May 1996 23:27:49 +0200 Received: (from j@localhost) by uriah.heep.sax.de (8.7.5/8.6.9) id WAA19115; Thu, 23 May 1996 22:49:41 +0200 (MET DST) From: J Wunsch Message-Id: <199605232049.WAA19115@uriah.heep.sax.de> Subject: Re: Hi again: PD optical drives To: freebsd-scsi@freebsd.org Date: Thu, 23 May 1996 22:49:41 +0200 (MET DST) Cc: lada@ws2301.gud.siemens.co.at (Hr.Ladavac) Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: <199605221045.AA188851902@ws2301.gud.siemens.co.at> from "Hr.Ladavac" at "May 22, 96 12:45:02 pm" X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E X-Mailer: ELM [version 2.4ME+ PL17 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-scsi@freebsd.org X-Loop: FreeBSD.org Precedence: bulk (Moved to freebsd-scsi, seems more appropriate.) As Hr.Ladavac wrote: > > I've got an MO drive working with the `od' driver, in case this is > > what you mean. > > A relatively new "Phase Change" technology. Somewhat similar to MO, but > not quite - a rewritable purely optical. > > `od' driver could be interesting as a start, but these things combine > a SCSI CD-ROM reader on one LUN, and a Removable Media on another > (not at the same time, though.) Ah, ok. We're still in need for a good design of how to share the CD-ROM driver with the WORM driver (since all CD-R devices constitute a superclass of CD-ROM). So we should try to find a good way how to arrange for this functionality. Basically, a `pd' driver would be nothing else than an `od' driver on LUN 0, and a `cd' driver on LUN 1. The only specific code would be the driver probe. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)