Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!zephyr.ens.tek.com!tekcrl!tekgvs!keithe
From: keithe@tekgvs.LABS.TEK.COM (Keith Ericson)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Perstor comments wanted.
Message-ID: <6991@tekgvs.LABS.TEK.COM>
Date: 1 Mar 90 20:31:05 GMT
References: <9027@ingr.com>
Reply-To: keithe@tekgvs.LABS.TEK.COM (Keith Ericson)
Organization: Tektronix, Inc., Beaverton,  OR.
Lines: 19

In article <9027@ingr.com> fordke@ingr.com (Keith Ford x8614) writes:
>What do you know about the Perstor drive controller.  It discussed by
>Jerry Pournelle in the latest issue of Byte magazine.  It will almost
>double the amount of space on a hard disk.  Will it work with MFM,
>RLL, SCSI, and ESDI?  What would it do to a Seagate ST277R-1 65Mb RLL
>drive?

We returned the Perstore ARLL (Advanced (?) RLL: does that answer the
"RLL,SCSI,ESDI?" question?) board we had in for evaluation: it would only
run at 2:1 interleave, and that's too slow.  They may have sped it up - this
was some time ago - but I haven't bothered to look at it again.

We prefer SCSI: a 15 Mbit/sec drive will usually turn in a CORE27 timing of
about 1.4 megabytes/sec transfer rate.  The 15 Mbit/sec ESDI do essentially
the same.  (This with Adaptec controllers: 1542A for SCSI; 2322B-8 for ESDI.
The only WD adapter I've tried was an EDSI that I _think_ wasn't rated for
15Mbit/sec, so the results aren't valid...)

kEITHe