compress

ECM-COMPRESS(1) 					      General Commands Manual						   ECM-COMPRESS(1)

NAME

       ecm-compress - selectively strips error correction codes from CD images

SYNOPSIS

       ecm-compress  cdimagefile [ecmfile]

DESCRIPTION

       ecm-compress  reduces  the  size  of a CD image file (ISO, BIN, CDI, NRG, CCD or any other format that uses raw sectors) by eliminating the
       Error Correction Codes (EEC) and Error Detection Codes (EDC) from each sector when possible.

       Since the data ecm-compress strips is usually nearly impossible to compress with traditional tools, the resulting ECM  file  will  compress
       far better than the raw CD image.

       Hard drives already have mechanisms to protect data integrity, EEC/EDC data can thus be discarded safely.

       This data can then be generated again using the command ecm-uncompress.

       Because	ecm-compress only discards EDC/ECC data for sectors where it's verifiably possible to recreate that data, the process is lossless.
       In case of copy protection, ecm-compress will preserve the bogus data.

EXAMPLES

       ecm-compress foo.bin
	      strips the ECC/EDC data from the foo.bin CD image and save the resulting file as foo.bin.ecm

       ecm-compress foo.img foobar
	      strips the ECC/EDC data from the foo.img CD image and save the resulting file as foobar

SEE ALSO

       ecm-uncompress(1).

AUTHOR

       ecm-compress was written by Neill Corlett.

       This manual page was written by Loic Martin <loic.martin3@gmail.com>, for the Debian project (but may be used by others), using	the  docu-
       mentation written by ECM author Neill Corlett.

								 December 22, 2008						   ECM-COMPRESS(1)