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From: aland@infmx.UUCP (Dr. Scump)
Newsgroups: comp.sys.ibm.pc
Subject: Re: RLL controllers with MFM drives
Summary: voice coil vs. stepper motor and MFM vs. RLL are separate issues
Message-ID: <2557@infmx.UUCP>
Date: 26 Oct 89 01:42:40 GMT
References: <none| <2546@bingvaxu.cc.binghamton.edu> <4265@ncsuvx.ncsu.edu> <35883@srcsip.UUCP> <4273@ncsuvx.ncsu.edu>
Reply-To: aland@infmx.UUCP (alan denney)
Organization: INFORMIX Professional Services ("Peace thru Normalization")
Lines: 25

In article <4273@ncsuvx.ncsu.edu| unkydave@shumv1.ncsu.edu (David Bank) writes:
|
| ,.  In response to Brynn Roger (rogers@src.honeywell.com):
|
|       Nope. I don't sell hard drives. I merely install and maintain
|them and diagnose them when they go bad. 
|
|       Contrary to your assertion, plated media is NOT the sole
|basic difference in RLL-rated drives. The biggest single difference
|is in the use of VOICE COIL technology in the armature control
|mechanism. This is what allows the mush more closely controlled
|head movement demanded by RLL. The plated media simply makes
|for a more reliable rusty pie plate.
|...
|Unky Dave
|unkydave@shumv1.ncsu.edu

What does voice coil have to do with it?  

There are MFM voice-coil drives (e.g. ST40XX) and RLL stepper-motor
drives (e.g. ST2XXR, I think).  These are two separate issues.

--
    Alan S. Denney  @  Informix Software, Inc.    
         {pyramid|uunet}!infmx!aland