I recently bought a drive docking station for drives to make some back ups to drives not in my system. In my computer I currently have a 256GB SSD for my OS (Windows 7) and a 2TB HDD for storage.
I plugged a 500GB HDD into the docking station and copied all the files and folders (~234GB) from my storage drive and pasted it to the 500GB HDD. After the transfer completed I ended up with a large difference in size (~100GB) for the total copied data.
For the life of me I cannot figured out why the size dropped so much. Any explanations?
Possibly why the drive is in use some files are uncompressed for use but upon copying then are compressed?
EDIT: As per the first comment I selected all the files and folders on the drive and looked at the properties. I guess the data is the same size.
So the question now is, why the differences in the size from the way I compared them initially?