Firstly, do not format this hard drive before you’ve copied off all your needed movies, for the formatting process may damage your data.
Secondly, opt for an efficient data recovery tool to regain your inner moves on this drive. There are plenty of data recovery tools online. But, not all of them can completely restore all your movies back. You should pay much attention to select a right one. Google “
data recovery software” over the internet and make your own decision after doing some researching.
Thirdly, follow the instruction of this data recovery software to retrieve your inaccessible movies.
Fourthly, format this hard drive to return its normal use after successful data recovery.
In the future, you should never forget to back up all your important data on separate drives.