Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

How can I check to make sure that the iso I downloaded is bootable, before I burn it?

share|improve this question

6 Answers 6

up vote 10 down vote accepted

isoinfo can probably tell you if it has the right files to boot if you want quick and dirty. isoinfo -l -i is_it_bootable.iso will list the directory structure so you can check for files a live cd / bootable cd should have.

isoinfo -d -i is_it_bootable.iso will tell you if the CD has an El Torito section. Ubuntu's live CD iso reports:

Eltorito validation header:
Hid 1
Arch 0 (x86)
ID ''
Key 55 AA
Eltorito defaultboot header:
    Bootid 88 (bootable)
    Boot media 0 (No Emulation Boot)
    Load segment 0
    Sys type 0
    Nsect 4
    Bootoff 8F 143
share|improve this answer

You check the MD5SUM. See https://help.ubuntu.com/community/HowToMD5SUM.

The iso at http://www.ubuntu.com/desktop/get-ubuntu/download is guaranteed by ubuntu to be bootable, a valid MD5SUM therefore asserts that the iso is bootable.

share|improve this answer
1  
The md5sum tells if the iso is bootable? (I want to know if it's bootable, not if it was correctly downloaded) –  Tom Brito Mar 24 '11 at 17:22
1  
If the file on the source site was bootable, and md5sum gives the same result on both copies, then there's an insignificant chance that the files differ, and you can assume that your copy is bootable, too. –  waltinator Jan 1 '12 at 19:28

If you have a good-enough CPU, install VirtualBOX, and setup some Virtual Machine. Make it point to the ISO as the CDROM, and configure it to first boot from CDROM. It willboot from the ISO file directly, without actually having to burn the file.

Another thing that I always do, as a general practice, is to actually put the ISO on a USB key and boot from it, which is something now possible with most computers. UNETBOOTIN (just google it) will do this for you. Just expect the USB disk to be completely wiped.

I now never boot from a CDROM anymore. I can't remember the last time I actually burned a CDROM.

share|improve this answer

Performing a cryptographic hash verification of the ISO file you downloaded consists of the following steps.

  1. Open a terminal and type the following:

    sudo md5sum 
    

    Note: there's a space after the md5sum.

  2. Now open Nautilus and browse to the folder containing the ISO file.

  3. Drag the ISO file to the open terminal window. This will insert the path / filename of the ISO file into the terminal window.
  4. Press Enter in the terminal window.
  5. The first part of the output is the MD5 hash of the CD.
  6. Go here and find the directory that corresponds to your release and find the file MD5SUMS. Compare the hash of your ISO file to the appropriate entry in that file.

If the two hashes do not match, then your ISO file is corrupt and you will need to download it again.

share|improve this answer
    
Why are you using sudo? –  Mechanical snail Jan 3 '13 at 21:31

HI, for any distro you are trying to download just use LinuxLive Usb creator it will download the right iso for you and verify at the same time hope this helps.

share|improve this answer

Its very simple we will go step by step...

  • By using PowerISO.
  • First download and install PowerISO.
  • Open PowerISO.
  • Then click on FILE and then on OPEN and browse and open the ISO file.
  • When you have opened that ISO file if that file is bootable then in the lower left end, it shows "Bootable image". If not a bootable image, then it shows "Nonbootable image".

enter image description here

share|improve this answer
    
This looks a lot like a Windows program. –  guntbert Aug 12 '13 at 10:22

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.