Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!mcvax!ukc!etive!hwcs!neil
From: neil@cs.hw.ac.uk (Neil Forsyth)
Newsgroups: comp.sys.atari.st
Subject: Re: 2K of disk space lost?
Message-ID: <2244@brahma.cs.hw.ac.uk>
Date: 6 Apr 89 09:20:04 GMT
References: <8903211617.AA27122@uk.ac.ucl.sm.uxm> <54471@yale-celray.yale.UUCP> <837@per2.UUCP>
Reply-To: neil@cs.hw.ac.uk (Neil Forsyth)
Organization: Computer Science, Heriot-Watt U., Scotland
Lines: 43

In article <837@per2.UUCP> dag@per2.UUCP (Daniel A. Glasser) writes:
>This involved telling the
>OS that there were two extra clusters (in the disk configuration in block 0)
>and marking the last two clusters as bad in the FAT.  The OS would never
>try and access these clusters, since they were "known" to be bad, and the
>buggy OS code would have no trouble allocating the last two real clusters
>because the bug is in the determination of which FAT entry corresponds to
>which cluster on allocation only.  I don't remember if I ever tried this
>on a floppy, I know I never tried it on a hard drive.  It is my belief,
>however, that the kluge will work and won't break on a fixed OS.
...
>I hope this helps someone.  Alan -- What's your opinion of this hack?
>Any problems that I missed?  Also, a question about TOS 1.4 -- Can
>it handle cluster sizes != 2 sectors?

Yes it does work on a floppy and no I'm not going to do it on a hard drive.
Since Allan said I would get away with this, I'm going to put it in the next
version of AMFT. 812032 bytes free and still only 80 tracks!


>
>						Daniel A. Glasser
>-- 
> _____________________________________________________________________________
>    Daniel A. Glasser                           One of those things that goes
>    uwvax!per2!dag                              "BUMP!!!(ouch)" in the night. 
> ---Persoft, Inc.---------465 Science Drive-------Madison, WI 53711-----------


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! Neil Forsyth                           JANET:  neil@uk.ac.hw.cs             !
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