My Passport essential 500gb

Hi Guys,

I was using the My passport essential to store movies, music, etc and recently i started storing blu ray files or files that were bigger than 4gb and i found out that i have to reformat the hard drive and change the file system to NTSA. So, i took a backup of the contents and reformatted the drive. However, its now not recognisable by my plasma or the lg blu ray player. I also realised that originally it came with some system files and obviously when i formatted those files are gone as well and i didn’t took a backup of those as i thought they would be there anyway. Is anyone able to help as it how i can go about it?