SHA1 hash mismatch

Question

Hello! (This is a repost from the Microsoft community page as I was recommended to post this on here.)

I have discovered an archive of the windows 8 Consumer Preview direct download link from early 2012. I was planning on using it for development purposes, but the provided SHA1 file hash for the 32 bit english copy mismatches the one i downloaded. (the one provided at the archived page (

https://web.archive.org/web/20120302175855/http://windows.microsoft.com/en-US/windows-8/iso)

is E91ED665B01A46F4344C36D9D88C8BF78E9A1B39)

I used powershell and i made sure the algorithm was SHA1 (it may not have worked however) but is it normal for files download from the wayback machine to have different file hashes? (wayback machine page archives not archive.org's software page)

I am rather worried about this as it could be a tampered file, but also a corrupt download. (this took 2 hours to download so i dont really want to do that again)

I used the Get-FileHash command, have I used it incorrectly?

Thank you in advance!!

Answer 1

Hi Ashy P,

You can compute the SHA1 of the file by running Get-FileHash -Algorithm SHA1 -Path <FilePath>.

The hash value of a file is unique and you should always get the same hash value for the same file. The local file could be corrupted so it's recommended to download it again. If you still get the wrong hash value, the source file is likely to be corrupted.

Best Regards,

Ian Xue

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