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 Loïc Martin <loic.martin3@gmail.com>,
for the Debian project (but may be used by others), using the documentation
written by ECM author Neill Corlett.
