---
name: "isohybrid.pl"
section: "1"
platform: "linux"
package: "syslinux-utils"
version: "3:6.04~git20190206.bf6db5b4+dfsg1-3.1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/isohybrid.pl"
---

# isohybrid.pl(1)

Postprocess ISO images for hybrid mode (Perl)

## NAME

**isohybrid.pl** - Postprocess ISO images for hybrid mode (Perl)

## SYNOPSIS

**isohybrid.pl** \[*OPTIONS\]* *IMAGE*

## DESCRIPTION

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: isohybrid.pl is a Perl script, a C implementation of the same utility is available as [isohybrid(1)](/isohybrid/1.md).

## OPTIONS

- \-h

  Number of default geometry heads.

- \-s

  Number of default geometry sectors.

- \-entry

  Specify partition entry number (1-4).

- \-offset

  Specify partition offset (default 0).

- \-type

  Specify partition type (default 0x17).

- \-id

  Specify MBR ID (default random).

- \-forcehd0

  Always assume we are loaded as disk ID 0.

- \-ctrlhd0

  Assume disk ID 0 if the Ctrl key is pressed.

- \-partok

  Allow booting from within a partition.

## SEE ALSO

[*syslinux*(1)](/syslinux/1.md)

## HOMEPAGE

More information about the Syslinux project can be found on the homepage at \<*http://www.syslinux.org/*\>.

## AUTHOR

isohybrid.pl was written by H. Peter Anvin \<*hpa@zytor.com*\>.

This manual page was written by Daniel Baumann \<*mail@daniel-baumann.ch*\>.