Path: utzoo!attcan!uunet!samsung!usc!snorkelwacker!husc6!bu-cs!encore!pinocchio
From: terryk@pinocchio (Terence Kelleher)
Newsgroups: comp.periphs
Subject: Re: Disks with Multiple, Independent Sets of Heads
Message-ID: <10385@encore.Encore.COM>
Date: 17 Nov 89 13:37:55 GMT
References: <5995@wiley.UUCP> <10144@alice.UUCP>
Sender: news@Encore.COM
Reply-To: terryk@pinocchio (Terence Kelleher)
Organization: Encore Computer Corp
Lines: 26
In-reply-to: andrew@alice.UUCP (Andrew Hume)

In article <10144@alice.UUCP>, andrew@alice (Andrew Hume) writes:
>
>
>imprimis sells a version of their 8" 1.2GB sabre drives that has
>two independent heads (for a total I/O bandwisth of 6MB/s).
>its called a "Sabre 2HP".

The Sabre 2HP does not have 2 sets of heads.  It has the same HDA as
the  standard Sabre 1230.  What is has is electronics that allows it
to read/write from 2 heads at a time rather than one.  It has 2
read/write channels.  This gives it higher speed data transfer, but
does not improve seek time or latency.

>
>imprimis is also developing a hooning sabre that connects to a
>xylogics or ciprico controller (which looks like an IPI-3 interface
>to a host). 
>Each head has an I/O path which means 9x3=27MB/s bandwidth. although
>in this case, i believe th heads have to be moved together.

Sounds expensive.  Where does the 9 come from?  The latest Sabres are
15 head drives.
-- 
Terry Kelleher, Encore Computer
Phone: 607-798-9602
Internet: terryk@encore.encore.com