From a quick google search it appears that its to do with NTFS.
The NTFS file system stores some file properties in Alternate Data Streams (ADSs). When copying to a non NTFS drive these streams do not get copied, which the warning message is all about. As most people are copying music from a NTFS to the a non ntfs nas I’m not sure why the message is generated.
Is this general music (mp3) in a folder or something special.
