Latest Update now my external HD not showing up

Something VERY bizarre is happening! I used my external HD to transfer all content from my old Xbox HD, to my new 320gb HD. There is absolutely NOTHING on my external HD now. Yet I've found if I start skyrim up and plug in my external HD it sees the DLC?!?!
There is no Skyrim content on my external HD only the Xbox HD! I will also add that I originally downloaded both DLCs to my old 250Gb Xbox HD so the licences is still on there. I'll also add I'm connected to Xbox live so licenses should not matter!!

This video shows the latest update they released for the Cryengine sdk. Watch in Hd.

[View:http://www.youtube.com/watch?v=r5nB9u4jjy4]

I am having the same problem. My external hd worked before the update. Now it can be read at all.

Is anybody else having the same problems as me. See below;

I have several issues that I feel need addressed. I am a member of the Dashboard Preview program. But ever since the update it has been nothing but problems. (1) I installed Mass Effect with no problem until I booted it up. Since there was no save data
it asked where to save it. It only listed the Cloud. It didn't detect the internal HD or my 1TB external HD. I have never had a problem saving/running games stored on my external HD until now. (2) When I go under Settings_System_Manage Storage, my internal
and external HDs show up but not the Cloud. (3) I am unable to report the above listed problems via the Preview Program without it crashing. I understand that he Backwards Compatibility is still somewhat in a beta phase. But these are issues I feel need
addressed.

I have a problem with my WD my book external hd. We lost power, a week ago, then all I could get to show on both internal, and external hd's, was the 360 games, I had downloaded a while back, not any of my xbx1 games. I finally unplugged my external wd
my book hd, and all my xbx1 games appeared. I'm not sure why, but I am guessing the power outage did something to my my book hd. I now show only xbx1 games, no 360 games, doesn't make sense. I just might buy a Seagate 1 or 2 tb hd, see if it works out better,
don't know how to check wd hd to see if it is functioning proper.