From: utzoo!decvax!harpo!floyd!vax135!cornell!tesla!jeff
Newsgroups: net.audio
Title: Re: Re: various comments from a new contributor
Article-I.D.: tesla.50
Posted: Fri Apr 29 11:00:40 1983
Received: Mon May  2 01:53:27 1983
References: allegra.1279

No, the reason they are 4.42" in diameter is because that is 12cm,  a metricization
of the 12" diameter of analogue discs.
J.F.