I came across a strange issue when backing up a external drive.
so i have two identical drives 1.81 TB Formatted
i used Robocopy in mirror mode to transfer the contents of one of the drives to the other the data was only videos and pictures so i saw no need to clone the drive directly,
when the procedure finished the destination drive was larger than the source drive by nearly 100GB.
I checked both drives with Win Merge and it displayed that all files were identical.
My first though was that perhaps i had set one of the drives to a different cluster size however checking the partitions they were both formatted identically.
can anyone explain how two identical drives can have a size mismatch that significant and how the files on the destination drive can be large than the source drive ?
i should note i ran chkdsk on both volumes and there were no errors reported and both drives passed a extended smart test
Edited by mikeloeven, 13 September 2015 - 12:50 PM.