How to verify that the ISO I downloaded is bootable before I burn it?

Question

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

Answer 1

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

Answer 2

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.

Answer 3

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.

Answer 4

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.

Answer 5

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.

Answer 6

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

• BY USING POWER ISO.
• first download and install power iso.
• open the power iso.
• 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 RIGHT END it shows BOOTABLE IMAGE if not a bootable image then it shows NON BOOTABLE IMAGE.

NOTE: IT SHOWS AT THE LOWER RIGHT CORNER: