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 Readme for:  Utility » Filetool » ecm.lha


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: 574  (Current version)
574  (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


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

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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