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I have extracted my iso to my pendrive instead of letting a boot utility software do it. Now I can't boot my pc with that pendrive. Moreover, it was formatted in windows prior to copying iso contents. Hence, I think this is what makes grub rescue not detect the file system.

I would like to know what a boot utility software (like pendrivelinux, or startup disk creator, etc) does. I hope this will guide me in creating a bootable drive, manually.

Edit:

I think I've found a partial answer. But what is a hybrid iso? How to create one?

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deostroll
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2 Answers2

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Unetbootin has worked well for me. Very straight forward GUI.

Also, I would always format your pen/thumb/flash drive as FAT32, as any OS can see it.

http://unetbootin.sourceforge.net/

GoOnGetErDone
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Here are the files it creates:

enter image description here

Look inside the EFI/Boot directory and you will find Bootx64.efi which triggers the BIOS to boot from the USB:

enter image description here

Inside the syslinux.cfg file here is what you will find, this is the menu of options for starting up in failsafe mode, live mode, etc...:

default menu.c32
prompt 0
menu title UNetbootin
timeout 100

label unetbootindefault
menu label Default
kernel /ubnkern
append initrd=/ubninit menu_amd64 -- menu_486 -- menu_486


label ubnentry0
menu label menu_amd64
kernel /EFI/BOOT/vesamenu.c32
append initrd=/ubninit menu_amd64 -- menu_486 -- menu_486


label ubnentry1
menu label menu_486
kernel /EFI/BOOT/vesamenu.c32
append initrd=/live/initrd2.img boot=live config live-media=removable apparmor=1 security=apparmor nopersistent noprompt timezone=Etc/UTC block.events_dfl_poll_msecs=1000 splash noautologin module=Tails  quiet


label ubnentry2
menu label Live (failsafe)
kernel /live/vmlinuz2
append initrd=/live/initrd2.img boot=live config live-media=removable apparmor=1 security=apparmor nopersistent noprompt timezone=Etc/UTC block.events_dfl_poll_msecs=1000 splash noautologin module=Tails  noapic noapm nodma nomce nolapic nomodeset nosmp vga=normal


label ubnentry3
menu label Live
kernel /live/vmlinuz
append initrd=/live/initrd.img boot=live config live-media=removable apparmor=1 security=apparmor nopersistent noprompt timezone=Etc/UTC block.events_dfl_poll_msecs=1000 splash noautologin module=Tails  quiet

Look inside the live folder and here is what you will see... notice the large file that is highlighted: That is the contents of the image or distro you are using

enter image description here

That is best way I know to explain it... manually doing this will take you hours.

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GoOnGetErDone
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