Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
ISOBOOT(8)		  BSD System Manager's Manual		    ISOBOOT(8)

NAME
     isoboot --	Boot code for hybrid ISO/USB images on BIOS-based computers

DESCRIPTION
     isoboot is	used on	BIOS-based computers to	boot from an ISO image that
     has been written to a USB flash drive or other HDD-like device.  isoboot
     is	installed in a freebsd-boot partition with mkimg(1).

IMPLEMENTATION NOTES
     The El Torito standard for	bootable CDs provides a	32KB "System Area" at
     the beginning of an image.	 To create an image that is able to be booted
     by	the BIOS as either a CD-ROM ("ISO") and	as a more HDD-like image (e.g.
     on	a USB flash drive) it is necessary to have both	a standard El Torito
     boot catalog containing a HDD-style partition table and boot code.
     isoboot is	intended to be placed in a GPT partition to allow the system
     to	find the standard FreeBSD loader(8) in the ISO filesystem later	in the
     image.

BOOTING
     isoboot looks for an ISO filesystem image on the device it	was booted
     from and seeks to read either the primary FreeBSD loader(8) or kernel
     from there.

SEE ALSO
     mkimg(1)

HISTORY
     isoboot appeared in FreeBSD 12.0.

AUTHORS
     This manual page written by Benno Rice <benno@FreeBSD.org>.

BSD				March 30, 2018				   BSD

NAME | DESCRIPTION | IMPLEMENTATION NOTES | BOOTING | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=isoboot&sektion=8&manpath=FreeBSD+13.0-RELEASE+and+Ports>

home | help