Only ready 10% on my 2tb EH

we have over 3000 files saved to our 2 tb external hardrive. It is encrypted so others can not remove our files. “READ ONLY”  My husband used it and accessed all the files on a different media player while in  Iraq, so we bought this media player to do the same set-up over here. Out of 3000 files it is only reading 336, mostly movies that start with numbers and only some of the As and Bs…and thats it!!! I can see how encryption may be problematic if it wasnt so isolated to only those few numbers and letters but not 90% of the movies are not even showing up. Can  you help?

Ok, how did you transfer the files to your drive? If you just copy and paste one file do you have the same issue?