Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!um-math!hyc
From: hyc@math.lsa.umich.edu (Howard Chu)
Newsgroups: comp.sys.atari.st
Subject: Re: TURBODOS
Keywords: Zeroing partitions; cache
Message-ID: <606@stag.math.lsa.umich.edu>
Date: 30 Mar 89 04:54:20 GMT
References: <1269@blake.acs.washington.edu>
Sender: usenet@math.lsa.umich.edu
Reply-To: hyc@math.lsa.umich.edu (Howard Chu)
Organization: University of Michigan Math Dept., Ann Arbor
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In article <1269@blake.acs.washington.edu> a360ad@blake.acs.washington.edu (Gnurr) writes:
%Hi.
%
%I recently started using TURBODOS with a Seagate 296N and
%Supra host.
%
%I have had quite a time figuring out why on several (not all)
%occasions when autobooting with GULAM, my gulam.g file gets
%truncated.  When recopying my gulam.g from a floppy ... a reboot
%seemed to be no problem.
%
%ALso... i found strange things with ZEROing a partition using
%either SUPRA or ICD utils.  After copying some files to
%partition f:\ , i tried zeroing the partition.  Whether i 
%used Supra or ICD, f:\ still listed all the files.  I
%could emacs the files as well..... I discovered that the
%only way to get the directory to look empty was to reboot.
%Does this mean that zeroing a partition simply allows one to
%start writing to the lowest sectors in the partition again?
%Why didn't ZEROing the partition erase the files..?
%I have to assume it wasn't a conflict in cache..as i turned
%gulam's cache off.. and the weirdness still persisted.
%Also... if it were simply a cache conflict, i would think i
%wouldn't be able to read the files.
%
TurboDOS maintains a directory cache of its own. That's a partial
explanation of the problem. Programs that read and write directly to
particular disk sectors probably manage to do so without telling
TurboDOS what they're doing, so....

Also, as I recall, it's not possible to access block 0 of a drive
when TurboDOS is active. (Someone out there know more about this?
This is my shady memory of firsthand observation augmented by
net rumors...) As such, doing things with SUPEDIT isn't going to
work very well while TurboDOS is active.

Dunno why your gulam.g file is getting truncated. I use gulam, but I
don't autoboot it...
%Question: What am i risking using TURBODOS?
%          Is it best to rebuild my drive and recopy
%          everything back in after having installed
%          TURBODOS ???????? 
%		  
%
%          Am i the only one who has to reboot after
%          ZEROing a partition when running TURBODOS?
%
%Your words of wisdom are gratefully consumed....
%
%-kevin
%a360ad@blake.acs.washington.edu


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