From owner-freebsd-current Fri Mar 14 00:21:09 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id AAA06621 for current-outgoing; Fri, 14 Mar 1997 00:21:09 -0800 (PST) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by freefall.freebsd.org (8.8.5/8.8.5) with SMTP id AAA06611 for ; Fri, 14 Mar 1997 00:21:04 -0800 (PST) Received: (from uucp@localhost) by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id JAA23490 for freebsd-current@FreeBSD.ORG; Fri, 14 Mar 1997 09:21:03 +0100 Received: (from j@localhost) by uriah.heep.sax.de (8.8.5/8.8.5) id JAA13659; Fri, 14 Mar 1997 09:02:14 +0100 (MET) Message-ID: <19970314090213.KU02331@uriah.heep.sax.de> Date: Fri, 14 Mar 1997 09:02:13 +0100 From: j@uriah.heep.sax.de (J Wunsch) To: freebsd-current@FreeBSD.ORG Subject: Re: worm0 and cd imaging References: <199703130858.DAA06544@hda.hda.com> <199703140533.QAA12400@genesis.atrad.adelaide.edu.au> X-Mailer: Mutt 0.60_p2-3,5,8-9 Mime-Version: 1.0 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 Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: <199703140533.QAA12400@genesis.atrad.adelaide.edu.au>; from Michael Smith on Mar 14, 1997 16:03:17 +1030 Sender: owner-current@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk As Michael Smith wrote: > Of curiosity, how many SCSI CD/burner devices support the scsi COPY > command? This would make for completely hands-off duplication, which > would be even better 8) I don't know of any, and given the rather complicated handling in preparation of burning a track, it probably wouldn't make too much sense, too. But people often tend to overestimate the CD-R data rates anyway, just only since these drives have some tight timing requirements. The rate itself is fairly low, most devices still can't burn faster than 300 KB/s (for CD-ROM data, that's 350 KB/s audio). This is a pretty low rate if you compare it to a disk, or the bandwidth of a SCSI bus. Hence, the overhead of piping all the data through the CPU once isn't noticeable. -- 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. ;-)