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Path: utzoo!mnetor!seismo!lll-lcc!well!jl
From: jl@well.UUCP (John Leininger)
Newsgroups: comp.sys.mac
Subject: Re: Using single-sided disks double-sided.
Message-ID: <3300@well.UUCP>
Date: Sat, 13-Jun-87 03:59:01 EDT
Article-I.D.: well.3300
Posted: Sat Jun 13 03:59:01 1987
Date-Received: Sat, 20-Jun-87 19:45:56 EDT
References: <5352@ut-ngp.UUCP> <948@apple.UUCP> <983@killer.UUCP>
Lines: 14
Keywords: Disks double-sided single-sided
Summary: Single Sided vs Double sided disks



I was told by folks in the disk industry that when making ds disk both sides
are verified.  If one side passes and the other fails that will be put into
a ss box.  But when verifying ss only one side is verivied if it fails than
the other side is tested and if it passes it is packed as ss.
so you can get a ss disk that is just like a dd except that one side did
not verify or that it was not verified.
It is also my understanding that verification is much less tolerant than
the drives that use the disks.
I have been using ss disk as ds ever since the 800k drives came out and
have had very few that would not format and none that lost data.
floppies are perhaps the most durable items in the entire system after the
power cords.