andrew_lowe1

<p>Wouter - They are both NTFS</p> <p>Matt - I am using Free File Sync. It was FFS that alerted me to the problem when it said 65GB of files didn't match. I think it is something to do with me moving my Photos folder by accident and drag and dropping it into a nearby folder (in Windows Explorer). I dragged it back and thought all was fine. I can't understand why Windows would have changed the files just by moving them though.</p>

<p>I just discovered that most of my photos that are backed up on an external hard drive have a slightly different file size to the originals. After comparing a number of different pairs of files using Winmerge I found most of the differenes seem to be at the beginning of the file (where the XMP/EXIF metadata is stored I think) but also I found some files that contain a large amount of extra data at the END of the file. Both images appear the same still as far as the photo is concerned, but I am worried that this might be a virus so would like to find an answer for these differences.<br> This is probably not the best place to post this, but hopefully someone might be able to direct me to another forum/website that is more appropriate for this unusual situation.</p>