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Postprocess ISO images for hybrid mode

see also : syslinux


isohybrid [OPTIONS] IMAGE

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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.



Number of default geometry heads.


Number of default geometry sectors.

-e, --entry

Specify partition entry number (1-4).

-o, --offset

Specify partition offset (default 0).

-t, --type

Specify partition type (default 0x17).

-i, --id

Specify MBR ID (default random).


Assume we are loaded as disk ID 0.


Assume disk ID 0 if the Ctrl key is pressed.


Allow booting from within a partition.

-?, --help

Display help.

-v, --verbose

Display verbose output.

-V, --version

Display version information.


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

see also



isohybrid was written by H. Peter Anvin <hpa[:at:]zytor[:dot:]com>.

This manual page was written by Daniel Baumann <>.

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