Micca Slim Portable Digital Media Player with HDMI and 2.5-Inch HDD Bay - Plays MPEG1/2/4, DivX, Xvid, RMVB, AVI, MOV, MP3, MP4
So far, yes, there is a limited number of formats it supports, I knew that.  The files that I have gotten to play, have looked great.  I was hoping it would play ISO backups of DVDs as well, but that was just wishful thinking and it wasn't advertised that it did so the fact that it doesn't is no big deal.  Every USB drive I have put in it has registered in seconds and worked fine.  Every hard drive I have installed has worked as removable storage from a computer but has not shown up when using the media pla