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 Readme for:  Utility » Filetool » ecm.lha

Ecm

Description: Reduces size of CD images
Download: ecm.lha       (TIPS: Use the right click menu if your browser takes you back here all the time)
Size: 69kb
Version: 1.0
Date: 20 Sep 2006
Author: Neill Corlett, AmigaOS 4.0 compile by Spot / Up Rough
Submitter: Spot / Up Rough
Email: spot/triad se
Requirements: AmigaOS 4.0 and a CD image.
Category: utility/filetool
License: GPL
Distribute: yes
Min OS Version: 4.0
FileID: 2089
 
Comments: 0
Snapshots: 0
Videos: 0
Downloads: 511  (Current version)
511  (Accumulated)
Votes: 0 (0/0)  (30 days/7 days)

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-----------------------------------------------------------------------------
ECM (Error Code Modeler) encode/decode utilities
Version 1.0
Copyright 2002 Neill Corlett
Distributed under the terms of the GNU GPL; read source code for details
-----------------------------------------------------------------------------

Introduction
------------

The ECM format allows you to reduce the size of a typical CD image file
(BIN, CDI, NRG, CCD, or any other format that uses raw sectors; results may
vary).

It works by eliminating the Error Correction/Detection Codes (ECC/EDC) from
each sector whenever possible.  The encoder automatically adjusts to
different sector types and automatically skips any headers it encounters.

The results will vary depending on how much redundant ECC/EDC data is
present.  Note that for "cooked" ISO files, there will be no reduction.


Setup / Usage
-------------

Run ECM with no parameters to see a simple usage reference:

    usage: ecm cdimagefile [ecmfile]

Where "cdimagefile" is the name of the CD image file, and "ecmfile"
(optional) is the name of the ECM file.  If you don't specify ecmfile, it
defaults to cdimagefile plus a .ecm suffix.

UNECM works the same way, but in reverse:

    usage: unecm ecmfile [outputfile]

"ecmfile" must end in .ecm.  If outputfile is not specified, it defaults
to ecmfile minus the .ecm suffix.


Thanks to
---------

ProtoCat for inspiring me to write this.


Where to find me
----------------

email: corlett()lfx.org
www:   http://lfx.org/~corlett/

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