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: Hard Disk Partitioning Tutorial
Keywords: TOS SUPRA BMS Hard disk Partitioning
Message-ID: <605@stag.math.lsa.umich.edu>
Date: 30 Mar 89 04:42:55 GMT
References: <457@lzaz.ATT.COM> <308@laas.laas.fr>
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Reply-To: hyc@math.lsa.umich.edu (Howard Chu)
Organization: University of Michigan Math Dept., Ann Arbor
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In article <308@laas.laas.fr> ralph@laas.laas.fr (Ralph P. Sobek) writes:
>
>Howard C. Johnson's article ( <457@lzaz.ATT.COM> ) on partitioning was
>very interesting.  I have an SH204 with partitions C, D, and E.  I
>would very much like to split my 10 meg E partition into 2 smaller
>partitions, GEM and Mac.  Can it be done without destroying partitions
>C and D?  If so, how?

It's easy enough to do, as long as you have something to edit the
partition table with. I'd recommend Supra's SUPEDIT program; it's a very
nice hard disk editor that lets you access the raw data or will let you
edit it in interpreted form. (When mucking with partitions, I definitely
like the latter so I'm shielded from really gross mistakes.)

Just check the table entries, say you have C & D with
     beginning  length
  C    0        10000
  D   10000     20000

and you want to split D - simple. Just change the entry for D:
  D   10000     10000
  E   20000     10000

Of course, if those blocks toward the end of partition D are actually in use,
you'll have some problems...

You'll also have to change the parameters of each partition's root directory.
That's another menu in SUPEDIT - shrink the size of partition D appropriately,
and create an appropriate root block for partition E - just copy the values
displayed for D. Finally, zero partition E - that will initialize the root
directory properly for regular use.

On second thought, you should probably also back up D before doing all this,
then zero D when you're done, and restore whatever files you want.

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