Date: Fri, 24 May 1996 12:48:47 -0400 (EDT) From: Peter Dufault <dufault@hda> To: joerg_wunsch@uriah.heep.sax.de Cc: freebsd-scsi@freebsd.org, lada@ws2301.gud.siemens.co.at Subject: Re: Hi again: PD optical drives Message-ID: <199605241648.MAA24419@hda> In-Reply-To: <199605232049.WAA19115@uriah.heep.sax.de> from "J Wunsch" at May 23, 96 10:49:41 pm
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> > (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
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