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Hi, Duncan Elliot wrote: > As far as I can see, this essentially trims off the first 3 bytes of the > custom isohybrid MBR image before applying it to the ISO. You probably mean this line: memcpy(mbr, &isohdpfx[hd0 + 3 * partok], MBRSIZE); The indize do not apply to bytes but to byte arrays of size MBRSIZE. extern unsigned char isohdpfx[][MBRSIZE]; (hd0 + 3 * partok) selects a particular MBR template from an array of six MBRs. See also http://www.syslinux.org/wiki/index.php?title=Isohybrid#MBR...

...<scdbackup at gmx.net> wrote: > Hi, > > Duncan Elliot wrote: >> As far as I can see, this essentially trims off the first 3 bytes of the >> custom isohybrid MBR image before applying it to the ISO. > > You probably mean this line: > > memcpy(mbr, &isohdpfx[hd0 + 3 * partok], MBRSIZE); > > The indize do not apply to bytes but to byte arrays of size MBRSIZE. > > extern unsigned char isohdpfx[][MBRSIZE]; > > (hd0 + 3 * partok) selects a particular MBR template from an array of > six MBRs. See also > http://www.syslinux.o...

Hi, I have been attempting to set up a multi-boot USB stick (i.e. multiple bootable ISO images on the one stick) I have had good success by: - processing ISO with isohybrid (with "partok" flag) - dd'ing ISO to primary partitions on the USB stick (e.g /dev/sdc2, /dev/sdc3, /dev/sdc4) - installing grub to USB stick and configuring to chainload to these partitions To remove the limit