This is my first post here, thanks for helping out! I have two external hard drives, HD #1 is NTFS and HD #2 is Mac OS Extended (I think this is the same as HFS+). I am copying many files from #1 to #2 (docs, pics, etc). I want to verify that all items copied correctly.On #1 (NTFS), folder A reports this size: 8,137,638,456 bytes (8.14 GB on disk) for 2,721 itemsOn #2 (HFS+), folder A' reports this size: 8,137,677,392 bytes (8.14 GB on disk) for 2,721 itemsHow can I verify that everything copied correctly? Kaleidoscope isn't helpful for this, since it just shows that the folders differ, without specifying how. Diff reports only this: that every subfolder in A' has .DS_STORE :diff -r /Volumes/WD Passport/A /Volumes/My Passport/A'                                                  Only in A': .DS_StoreOnly in A'/SUBFOLDER: .DS_StoreOnly in A'/SUBFOLDER: .DS_Store ...How can I verify that everything copied correctly? And is there something about NTFS and HFS+ file systems such that copying from one to the other results in different binary representations of files? 
Size difference copying from NFTS to HFS+
osx;file copy;ntfs