Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!wuarchive!uunet!mcsun!unido!mpirbn!p554mve
From: p554mve@mpirbn.mpifr-bonn.mpg.de (Michael van Elst)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Hard disk transfer rates
Message-ID: <1158@mpirbn.mpifr-bonn.mpg.de>
Date: 2 Sep 90 20:03:31 GMT
References: <1990Sep1.231510.10650@agate.berkeley.edu>
Reply-To: p554mve@mpirbn.UUCP (Michael van Elst)
Organization: Max-Planck-Institut fuer Radioastronomie, Bonn
Lines: 24

In article <1990Sep1.231510.10650@agate.berkeley.edu> c60c-1gd@e260-1c (Joon Song) writes:
>I'm sorry if this has been discussed before.  I've read several articles
>claiming that hard disk transfer rates through a SCSI port is as high as
>3.5 meg/sec.  Is this the actual throughput of the hard disk system?  
>Does this involve data being cached?  3.5 meg/sec is considerably faster
>than what I had thought possible for hard disk r/w.

I think there are some disks around that work with a data rate that high
but they don't use the SCSI bus.

The fastest SCSI disks I've seen are the 700Meg devices from Maxtor and HP
(and possibly more companies). With 56 sectors/track you can get about
1.6MB/sec sustained data rate.

But if you use several disks at a time you could add up their data rates
up to the limit given by the SCSI bus and the host adapter. With the
Amiga this is 3.5MB/sec therefore you could read from two such drives
at once and don't impact on the drives performance.

-- 
Michael van Elst
UUCP:     universe!local-cluster!milky-way!sol!earth!uunet!unido!mpirbn!p554mve
Internet: p554mve@mpirbn.mpifr-bonn.mpg.de
                                "A potential Snark may lurk in every tree."