Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!att!holin!doc
From: doc@holin.ATT.COM (David Mundhenk)
Newsgroups: comp.sys.ibm.pc
Subject: Are CDC 9415-86's RLL capable?
Keywords: hard disks,MFM,RLL,ESDI,SCSI
Message-ID: <583@holin.ATT.COM>
Date: 10 Jul 89 14:03:53 GMT
Organization: AT&T DSG Holmdel NJ USA
Lines: 36


        A  Q U E S T I O N  re.: RLL, MFM, etc.

I am currently using 2 CDC 9415-86 drives in my AT Compatible,
on a Western Digital (I believe) MFM controller (16 bit card).
The drives format out to about 70MB each. This is a total of
about 140MB's, but I'm a space hog and WANT MORE!
(I am also interesting in putting XENIX up on my machine but
don't want to forfeit Messy-DOS space.)
They are fairly fast (~28ms.) so I am happy with the speed.
However, I may want to upgrade to 80386 later so I'm considering
future speed requirements also...

My question is, are these drives capable of supporting RLL 
encoding? I am tempted to get an RLL controller and try it,
but thought I'd ask first. Would I be better of selling the
drives and getting either:

	1. Bigger MFM drive(s).
	2. RLL certified drive(s).
	2. Big ESDI or SCSI drives and controller?

Any advice on this topic would be appreciated.

Dave Mundhenk

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EMAIL: ...!att!holin!doc  | "I can't complain but |   /^,
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#include <std.disclaimer> |  - Joe Walsh          | /_./ (_l |/ <~_