Path: utzoo!utgpu!cunews!bnrgate!uunet!mcsun!ukc!axion!tharr!altman
From: altman@tharr.UUCP (Hugo Fiennes)
Newsgroups: eunet.micro.acorn,comp.sys.acorn
Subject: Re: Installing Hard Disks
Keywords: Hitachi Hard Disk
Message-ID: <1635@tharr.UUCP>
Date: 21 Jan 91 01:20:34 GMT
References: <1991Jan18.151427.23894@cns.umist.ac.uk>
Reply-To: altman@tharr.UUCP (Hugo Fiennes)
Followup-To: eunet.micro.acorn
Organization: Power Microsystems Ltd
Lines: 24

I'm probably slightly out on a few of these, so correct me if I'm wrong:

ST506 interface (as supplied is on a400 series) is 5Mbit transfer rate
from drive to controller.

RLL interface privides approximately 1.5x the storage capacity of a ST506
drive by using a (2,7) cosing scheme (or something like that!). RLL drives
have a transfer rate of 7.5Mbit/sec

IDE is a PC standard for a cheap drive, it's much like a simplified SCSI
bus, hence lower cost. The Archimedes 'ideA' hard disk interface provides
IDE interfacing for the Archimedes, allowing internal 2" IDE drives to go
into an a3000!

SCSI devices sit on a SCSI bus on which there can be 8 devices (inc computers,
drives, etc). High level commands are sent requesting sectors, etc and the
data is returned. Fast transfer rates (with SCSI-1) of 2Mbytes/sec in async
mode are possible.

Hugo
-- Hugo Fiennes ---------------------------------------------------------------
-- "HAL, you're not IBM compatible..."
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