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From: afdenis@lims05.lerc.nasa.gov (Stephen Dennison)
Newsgroups: comp.sys.ibm.pc.misc
Subject: Re: DS HD floppies
Message-ID: <1991Jun28.220658.23540@eagle.lerc.nasa.gov>
Date: 28 Jun 91 22:04:45 GMT
References: <1991Jun18.050747.26870@bronze.ucs.indiana.edu> <13217@uwm.edu> <1991Jun18.234702.9028@bronze.ucs.indiana.edu> <13264@uwm.edu>
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In article <13264@uwm.edu>, anthony@convex.csd.uwm.edu (Anthony J Stieber) writes...
>In article <1991Jun18.234702.9028@bronze.ucs.indiana.edu> ntaib@silver.ucs.indiana.edu (Nur Iskandar Taib) writes:
>>Incidentally, why don't HD diskettes have hub 
>>rings? You'll also notice that HD floppies 
> 
>I don't really know, I remember reading about how HD drives don't
>need them.  It seemed to me that hub rings are there to protect
>the hub from dammage, perhaps someone out there knows the real reason?
> 
One possible explanation I heard is that HD disketts have their magnetic 
media impregnated to thicker mylar disks for stability. The reasoning was 
that the hubrings "thicken" the DS DD disks for positive clamping, and the 
HD disks, being thicker initially, don't require them.

Could be BS but it made sense to me.

       "My life is a sine wave. Now, if I could just get the damned 
        amplitude down..."                         Stephen Dennison