boot hirens boot iso from grub2
 

I'm trying to boot hirensboot iso from grub2 but the result is that when I choose the menuentry "hirensboot" in grub2 it opens the first screen with the list of all the possibilities, in this point no problem, all it seems to be correct, but when I choose any option of this menu,(inside hirensboot) don't run and in the screen apperars a missage of error. I try twice but there is no way to boo it. I paste my 40_custom file for if you want to check it:

menuentry "Hiren's boot CD using memdisk 4.05" { set isofile="/Hiren's.BootCD.15.2.iso" linux16 /customboot/memdisk4.05 iso initrd16 (hd0,7)$isofile }

menuentry 'Hirens Boot CD' { search -f "--set-root /Hiren's.BootCD.15.2.iso" drivemap "/Hiren's.BootCD.15.2.iso" '(hd32)' drivemap '--hook' '' set root='(hd32)'; set legacy_hdbias='0' chainloader '()' }

menuentry "Hiren's boot CD using memdisk 5.01" { set isofile="/Hiren's.BootCD.15.2.iso" linux16 /customboot/memdisk5.01 iso initrd16 (hd0,7)$isofile }

My version of grub: 1.99-21ubuntu3.9 on ubuntu 12.04. Any help is welcome¡¡¡ thanks in advance.

Grub2 can boot iso files but not every iso file. My understanding is that it would need to configured to be able to boot as an iso by the developers of Hirens. You might try extracting the Hirens iso and booting it that way. I'm not familiar with Hirens so can't give any more detail.

You're right, can work in this way, I try to do it and we will see. Anyway just today I send a mail to hiren and I wait the solution ( if exists), once I know something new, I will post. And thanks a lot for your interest and for your fast reply :)

Might try grub4dos also.

some info about it
 

extract iso and then copy grub.exe (can be found in hbcd\dos\dos.gz)
and copy menu.lst from the hbcd folder to the root of the usb drive.
menuentry "HBCD" {
linux16 /grub.exe --config-file="find --set-root /HBCD/menu.lst; configfile /HBCD/menu.lst"
} This can be a solution but for the usb. I hope soon can I post the instructions for to do it within ext4, with grub2.