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From: kaufman@neon.Stanford.EDU (Marc T. Kaufman)
Newsgroups: alt.sys.sun,comp.periphs
Subject: Re: SCSI-2 vs IPI-2
Message-ID: <1991Mar17.164221.7666@neon.Stanford.EDU>
Date: 17 Mar 91 16:42:21 GMT
References: <1991Mar16.012045.20207@ncs.dnd.ca> <1991Mar16.072821.240@neon.Stanford.EDU> <1991Mar17.145652.27084@ncs.dnd.ca>
Organization: Computer Science Department, Stanford University, Ca , USA
Lines: 24

In article <1991Mar17.145652.27084@ncs.dnd.ca> rpburry@ncs.dnd.ca (Paul Burry) writes:

>According to the UnixWorld quote (p136 "IPI in the Sky")

>"... and currently supports Seagate Technology's Sabre parallel transfer disk.
>With a storage capacity of 2105 megabytes, the Sabre product uses eight 
>read/write heads simultaneously for transfer rates up to 24 megabytes 
>per second. ..."

That's the ST82105 Sabre-6 8HP, 8" drive with IPI-2 interface.
It has 16 R/W heads.

>The catalog also lists a IPI-2 3GB disk drive with a transfer rate of 
>27MB/second.

That's the ST82368K Sabre-6 9HP, 2368 megabytes (unformatted) with 18 R/W heads.

The Sabre 7 drives, which are 3000+ megabytes, only list transfer rates of
4.67 and 9.34 MB/sec.

Apparently the Sabre-6 drives are organized as 400000 bytes/track, 2 tracks
per cylinder, by having half the heads working at once.

Marc Kaufman (kaufman@Neon.stanford.edu)