From owner-freebsd-scsi Fri May 24 09:51:40 1996 Return-Path: owner-freebsd-scsi Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id JAA01539 for freebsd-scsi-outgoing; Fri, 24 May 1996 09:51:40 -0700 (PDT) Received: from hda (ip49-max2-bos.zipnet.net [199.232.252.149]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id JAA01522 for ; Fri, 24 May 1996 09:51:32 -0700 (PDT) Received: (from dufault@localhost) by hda (8.6.11/8.6.9) id MAA24419; Fri, 24 May 1996 12:48:50 -0400 From: Peter Dufault Message-Id: <199605241648.MAA24419@hda> Subject: Re: Hi again: PD optical drives To: joerg_wunsch@uriah.heep.sax.de Date: Fri, 24 May 1996 12:48:47 -0400 (EDT) Cc: freebsd-scsi@freebsd.org, lada@ws2301.gud.siemens.co.at In-Reply-To: <199605232049.WAA19115@uriah.heep.sax.de> from "J Wunsch" at May 23, 96 10:49:41 pm Reply-to: hdalog@zipnet.net X-Mailer: ELM [version 2.4 PL24] Content-Type: text 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. If it probes properly it should just work as is. If it doesn't a config hack should work. -- Peter Dufault Real-Time Machine Control and Simulation HD Associates, Inc. Voice: 508 433 6936 dufault@hda.com Fax: 508 433 5267