Why won't my videos play once transferred to an external hard drive?

I have a Seagate Backup Plus Portable Hard Drive.  Once I transfer a video onto it, it will no longer play.  Quicktime opens and plays the length of the video but there is no video.  The files are .MOV.  Even when I copy them back onto the desktop, they still do not work.  Suggestions?

MAC OS Extended (Journaled)

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