Windows 10: MD5 Hash number changing Upon Copying

I have a Outlook file Backup.pst size is about 1.8 GB which is not loaded in Outlook and Outlook is not open when I am copying the file from my hard drive to a USB. After copying using File Explorer the file the MD5 hash number on the file is different on the hard drive and the USB drive. Hash number gotten immediately after copying.


Please advise me why this is happening and how to fix it.

:)

 

Windows 10 MD5 / SAHA-1 Hash

How to know the downloaded WINDOWS10 md5/saha-1 Hash

 

Hashes mismatch while copying data

A hash is a numerical representation of a file. Basically, a complicated formula is applied to all the 0's and 1's and from that a long hexadecimal number is created. That number is called a 'hash.' (Not the same as the hash I smoke - that's different.)

When copying a large file (typically from the internet) you will frequently be shown the original file's hash. After copying the file you can calculate the hash of the copy with the same formula that was used to calculate the hash of the original. Now you
can compare the two hashes; if they are identical then the copy is identical to the original.

Therefore, a hash mismatch means that the file wasn't copied accurately. The cause depends on where you copied the file from and where you copied it to.

 

Check MD5 code in Windows

Hi BlueSky. I'm Greg, an installation specialist, 10 year Windows MVP, and Guardian Moderator here to help you.

There is a built-in Checksum calculator in Windows 10 to check MD5 hash See how here:

https://www.lifewire.com/validate-md5-checksum-...

See other options here for checking MD5 hash to find the one that suits you best:

https://www.nextofwindows.com/5-ways-to-generat...

I hope this helps. Feel free to ask back any questions and keep me posted. I will keep working with you until it's resolved.

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