Date   : Mon, 27 Jul 2009 14:32:41 +0100
From   : sai2791@... (Steve Inglis)
Subject: Level 3 Disk Layout

Im trying to reconcile the layout of a Level 3 disk formatted using  
beebem and WFSINIT against application note 75, which describes the  
disk layout.

ADFS partion Sector 0, bytes 246-248 contain the first sector of the  
NFS portion of the disk, (It doesnt really you need to divide the  
sector by the number of sectors per cylinder as an int to get the real  
sector number as its has to start at an integral number of  
cylinders ). I finally figured this out, but then sector 0 has a copy  
on the NFS portion which is pointed to by the sector bytes in ADFS  
partion sector 1, 246-248.

So i can with a little cheating get the start of the NFS partition,  
and from there illicitly read the number of sectors per cylinders and  
can work out what the sector id is ( I know that if im already looking  
for AFS0, i already know where the start is but its only proper to  
follow the design spec).

The problem i have is that no matter what calculation i make i can not  
(never) get this pointer to point to the actual (or integer) sector  
that the copy is actually written to.  Does anyone have any clues?  Is  
this a side effect of the WFSINIT program using manually set head/ 
cylinder settings.

Any advice/help greatfully received.