Different sizes of files when copied from a single source and pasted to another

Hello

I hope someone can help me understand why a file size can be different when it is copied from one source, pasted on another hard drive or on an external drive?

My job requires me to backup databases to an external source before making changes to a program / database to protect the info before any troubleshooting begins / changes are made. These databases can be several GB in size and take a relatively long time to copy depending on the size and the transfer speed, but when I compare the properties of each folder, after that the copy is often made that the sizes don't match exactly. Remember the difference may be that some Ko Mo, but nevertheless, this could represent information data, planning data or image data that must be preserved. Can someone explain why/how it happens and if it is a way to ensure an exact copy is made every time so I don't have to go back and make a second or third attempt to copy files on?

Thank you

David

David

Happy to help (its why do I volunteer here)

Copy/paste and drag-and - d├⌐poser are no error checking.  bad, bad bad.

A file that takes up 100 MB exactly on a 500 GB HD with 4 k sectors will not take the same place on a 1 to Hd with 8 k sectors.  There may be a slight varience between the two due to the size of area if for example the las, bit of info (it could be as little as 1 byte) is placed in an 8 k sector it will often say he used throughout the sector.

Since there is no apparent error checking if a network problem deletes the data it is not copied.

Same with ram

You can always google something like checking with file transfers in win 7

For an example of an application with error checking check this a https://codesector.com/teracopy (there are dozens)

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