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From: sarif@luehdorfia.dsl.tutics.tut.ac.jp. (Sarif Koichi) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: Ultra Wide Scsi - which controller? Date: 23 Apr 1997 16:52:37 GMT Organization: Dept. of Information and Computer Sciences, Toyohashi Univ. of Tech., Japan Lines: 31 Message-ID: <5jleol$796$1@colias.tutics.tut.ac.jp> References: <5j5gla$r88$1@csnews.cs.colorado.edu> <5j7ifv$f97$2@polaris.eurocontrol.fr> NNTP-Posting-Host: zephyrus.dsl.tutics.tut.ac.jp X-Newsreader: mnews [version 1.20] 1996-12/08(Sun) Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.Hawaii.Edu!news.lava.net!news.flex.com!www.nntp.primenet.com!nntp.primenet.com!news.maxwell.syr.edu!news-peer.sprintlink.net!news.sprintlink.net!sprint!uunet!in3.uu.net!202.232.2.100!np1.iij.ad.jp!wnoc-tyo-news!wnoc-sfc-news!wnoc-kyo-news!aist-nara!odins-suita!nuis!news.cc.nagoya-u.ac.jp!nfeed.gw.nagoya-u.ac.jp!server.tut.ac.jp!colias!sarif Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:39651 <5j7ifv$f97$2@polaris.eurocontrol.fr>の記事において roberto@eurocontrol.frさんは書きました。 >> > This is for a friend who is getting a new system and wants one of the >> > new 7200rpm drives... >> >> Tell him to remember that 2x 2 GB is better than 1x 4 GB. >> Oops, I just ordered a 4 GB hard drive. Could you tell me some logical explanation about this. I read in a 'zin, that the bigger the number is the better. My guess is: With one drive, it's true that bigger the capacity is the better. If you put 2 G in one cylinder and 4 G on another cylinder, with the same rpm spec, in the same time you get twice the data with the latter drive. But still the difference is small (subjective opinion). But, with Ultra Wide SCSI you can get nearly 40 MB/sec. Even 7200 rpm drive may not reach 10 MB/sec access time (How about the Seagate 10000 rpm?). With two drive in async tranfers mode you can get twice of the transfer rate, compare to one drive with twice capacity. (What happen if there is a sync drive using the data bus?) Is my guess is right? Just then, if you have 2 drives could you tell me which to put in one drive and what to put on the other drive. Could it be swap drive, and system drive (all in / directory). Thank's in advance, to everybody who follow this.