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3.2. Validating at the Windows Command Prompt

To check the files using the command prompt, download the program sha256sum.exe available from
The sha256sum.exe program computes and displays hashes. To use it, save sha256sum.exe to the same directory as the ISO files. Select Run... from the Start menu and then enter cmd for the name of the program to start a Command Prompt window. Then change into the download directory. Run sha256sum with each ISO file like this:
cd "C:\Documents and Settings\Owner\My Documents\My Downloads\Fedora"
sha256sum.exe Fedora-i386-DVD.iso
The program takes some time to complete, since it must read the entire ISO file.
Open the file CHECKSUM with a text editor, such as Notepad, to display its contents. Make sure the hash displayed by sha256sum.exe for each of the downloaded ISO files exactly matches the corresponding hash in the CHECKSUM file.
If all of the hashes match, you can burn the ISO file to disc. If a file does not match, download it again.