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 Message-ID: <19970314090213.KU02331@uriah.heep.sax.de> In-Reply-To: <199703140533.QAA12400@genesis.atrad.adelaide.edu.au>; from Michael Smith on Mar 14, 1997 16:03:17 %2B1030 References: <199703130858.DAA06544@hda.hda.com> <199703140533.QAA12400@genesis.atrad.adelaide.edu.au>
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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. ;-)
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