Postprocess ISO images for hybrid mode (Perl)



Starting in version 3.72, ISOLINUX supports a "hybrid mode" which can be booted from either CD-ROM or from a device which BIOS considers a hard disk or ZIP disk, e.g. a USB key or similar.

To enable this mode, the .iso image needs to be postprecessed with this utility.

Note: is a Perl script, a C implementation of the same utility is available as isohybrid(1).



Number of default geometry heads.


Number of default geometry sectors.


Specify partition entry number (1-4).


Specify partition offset (default 0).


Specify partition type (default 0x17).


Specify MBR ID (default random).


Always assume we are loaded as disk ID 0.


Assume disk ID 0 if the Ctrl key is pressed.


Allow booting from within a partition.


More information about the Syslinux project can be found on the homepage at <>.



AUTHOR was written by H. Peter Anvin <>.

This manual page was written by Daniel Baumann <>.

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