My External HDD disappear after the last update .. please help

hi
after the last update my external HDD disappear
when I open manage to see it .. it pops this message
" you must initialize a disk before logical disk manager can access it "
and the HDD is unallocated

I had a lot of work saved on that hard drive .. I can't lose these data
I'm afraid to do any thing that can cost me losing the data on it
tried to go back to my previous version of windows .. but it didn't solve the problem
I still can't access this HDD

Please help !!

I GOT it ... My GOD i got it back ..
I don't even know how !!!!!!!!
I just turn off the PC ..
open it again ... nothing new still missing my HDD
open Manage .. and Oh my god it's here and it's healthy again ... don't know how !!!
back to my computer .. and here it's

anyway ..
thnxx guys