File transfer problems

I use my book live for storing movies and photos and then access them using WD media player.

My problem is I have been trying to transfer files from my laptop to the My Book Live and some files get 3/4 done and I get a message (could not copy). The files that havn’t copied are over 1gb some are MP4 and MKV. I have copied these type and size file before without any problems. The problem doesnt seem to be related to the size or type of file as I can move other simler sized and type files.

Any ideas would be great thanks.

Make sure no other program like an anti-virus or firewall is interrupting the transfer.