I have a 1tb external hard disk which was working fine till yesterday. It fell down last week. After that, I transferred two files (total of 25gb) from my laptop into the external hard disk yesterday. The problem started after that. When, I tried to open any of all the files (a total of 11 including the two I transferred yesterday), it's suggesting to be formatted. The external hard drive is recognized in the disk manager to be healthy. Currently, I have turned the Easeus Recovery software on, it's showing 12 hours to be completed.