I have a pioneer 8200 that i am trying to play videos on.  I was able to do it before but the external hard drive that my movies were on died so i had to get a new one.  I bought another seagate 2TB drive and have loaded the same files that were on the last one.  The drive is plugged into USB 2 on the unit (just as before) but my unit keeps saying "unplayable file".  What am i missing here?

what extension/container is the unplayable file in? .avi....mkv....?

I've tried them all using a conversion software. It worked before with MP4 so thatwhat I'm trying to use.

Ok so here is some new information that is REALLY driving me crazy.  I have an 8GB flash drive that i formatted in fat32 and added 1 of my videos.  It played with no issue.  I tried to format the 2TB drive to fat32 and add the same video and i get unplayable file.  I have tried 3 different externals and formatted them in every possible way.  I know there is something i'm missing here but i can't figure this one out.  HELP HELP HELP