Source/destination file size inconsistant

Software WD Discovery
1

Just installed 2TB My Passport Ultra and ran two backups.  The first was a simple copy/paste from my desktop to a new folder on My passport.  The other was using the Smartware s/w that came with the unit.   I compared source/destination file sizes for both backups and was surprised to see that the backup sizes were different.  Both backups seem to have dropped folders/files from origninal.  Any help is appreciated.

Thanks

2

Welcome to the Community.

Which copy is larger? The manual copy or the SmartWare copy?

3

Thanks for your quick response.  I have been playing with this for awhile to try and identify the discrepencies.  As it stands, the original source and destination (via windows copy/paste)  are the same; the wd copy is different, more bytes, less folders and files.  Stats are:

Original Source  - 618,062,652,593 bytes, 99,016 files, 4,635 folders.

WD copy -            619,280,959,777 bytes, 97,389 files, 3,922 folders.

Took a quick look at some differences between the two:  WD seems to drop Thumbs.db and 0 byte folders. 

Will continue to identify differences.

Thanks for your suggestions.