Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!isc-br!hawk!wddami!wayned From: wayned@wddami.spoami.com (Wayne Diener) Newsgroups: comp.sys.amiga.hardware Subject: Re: SCSI II specs Message-ID: Date: 20 Sep 90 20:58:00 GMT References: <1232@tardis.Tymnet.COM> <3769@ruuinf.cs.ruu.nl> <14418@cbmvax.commodore.com> <1990Sep20.125810@wjg.enet.dec.com> Sender: uueagle@hawk.isc-br.com (Eagle Proj UUCP login) Lines: 27 >In article <1990Sep20.125810@wjg.enet.dec.com> guineau@wjg.enet.dec.com (W. John Guineau) writes: >In article <1232@tardis.Tymnet.COM>, jms@tardis.Tymnet.COM (Joe Smith) writes: > >[stuff deleted] > >|> >|> 3) Wide SCSI = 16 bit transfers at 5 million per second = 10 megabytes/sec >|> (SCSI-I and SCSI-II devices can co-exist on the 16-bit bus) >|> 4) Fast and wide = 16 bit transfers at 10 M = 20 megabytes per second. >|> > >SCSI II also specifies a 32 bit data path option. Couple that with FAST >and you get 40MB/s. Both 16 and 32 bit require a second cable (termed the Before everyone gets too excited about the _possible_ data transfer rates for high speed disk drives, just remember that you _cannot_ take the data off the disk & put it somewhere useful (i.e. memory) at any higher rate than the bandwidth of the bus. I don't know what the bandwidths of the Zorro I/II/III busses are, but I have serious doubts that a 40 MB (or even 20 MB) per second transfer rate is possible. -- |---------------------------------------------------------------| | // Wayne D. Diener | | // Spokane, WA | | \\ // E-mail reply to: | | \X/ To: isc-br!hawk!wddami!wayned@uunet.uu.net |