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I trying to install Fedora 15 on my system. I downloaded the DVD from the official Fedora download link. For downloading the ISO, I used Orbit downloader, but I did not test the checksum.

I burned the image and started the installation of Fedora, but after copying files (in the last step), it took a long time without any processing, then I got some error window.

Then my installation failed in the last step. Is Fedora 15 a stable version or not? If yes, then why did I get this error at end of the installation? Is it necessary to do a checksum verification of the ISO image? How can I test this checksum on Windows?

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up vote 2 down vote accepted

When burning installation DVDs, you should check the file and the DVD itself for errors. Otherwise problems such as those you described could happen.

Verification should ideally happen in two steps:

1. Verify the downloaded ISO file for integrity

You need to make sure there weren't any errors during download. While this is rather uncommon, it could sometimes happen.

  • Download the appropriate checksum file for your installation from the Fedora Verification site or copy the SHA1 checksum when you download the Fedora ISO.
  • Also download sha1sum for Windows for checking the SHA1 sum. You might also use Microsoft's FCIV.
  • Put this sha1sum.exe and the Fedora ISO into the same folder.
  • Then, go to Start → Run, enter "cmd".
  • Use the cd command to go to the directory where you put the sha1sum.exe and the Fedora ISO.
  • Run the following command:

    sha1sum.exe Fedora-15-i386-DVD.iso
  • Compare the output of this command with the SHA1 sum of the download. If they're the same, you're fine.

There's a similar tutorial here.

2. Verify the burned DVD for integrity

This is in my experience happening more often than download errors. You need to make sure the data on the DVD itself is exactly the same as the ISO file.

Depending on the software you used for burning, there should be an option to verify a DVD after burning. Look for it in the burning settings. If your DVD passed the verification, you should be fine.

Note that burning at lower speeds can lead to better results (i.e. less errors).

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