🚀 go-pugleaf

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>Date: 12-11-89 (09:28)           Number: 14589     CRS Premium Bulletin B
>  To: ALL                        Refer#: NONE
>From: kaleb@mars.jpl.nasa.gov      Read: YES
>Subj: MFM as an RLL drive?         Conf: (84) U-IBMPC
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On 89-12-11 kaleb@mars.jpl.nasa.gov (Kaleb Keithley) writes:
>>In article <MLM.89Dec11110300@hector.cs.brown.edu> mlm@cs.brown.edu
>>writes:
>>       Is it possible to use a MFM hard disk drive with an RLL
>>       controller? Are there particular MFM drives that will do it?
>>       How would I tell?
>>
>At the risk of starting a another flame fest, Yes, there is a
>99&44/100 percent chance that it will work.  I personally have over
>two years reliable use out of both Micropolis and Seagate MFM drives
>on RLL controllers.  Others have posted news of similar successful
>results.  Some people believe that you may experience a gradual
>degradation of the drive.

I have been told that older drives may be more tolerant of
RLL controllers because their surfaces are "more forgiving(?)".
Anyway, I successfully replaced the original Corona controller
with a W.D. RLL controller in my Corona portable XT.  Not only
did this upgrade give me 60% more capacity, it also allowed me
to improve the interleave and the transfer speed!  Furthermore,
this old (Shugart!) drive has NOT A SINGLE bad block on it!  Can
you say that about any newer drives, MFM, RLL, or otherwise?

Brad Grigor
Mainline Technologies
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