Firstly, it should be able to recover data lost due to multiple reasons, like deleted data, data lost from formatted partition, and data lost from damaged partition or lost partition.
Secondly, excellent data recovery software for external hard drive should completely supports various kinds of commonly seen external hard drives.
At last, for most common users, excellent data recovery software for external hard drive must have good operability. If we are unable to accomplish operations, it can not be called excellent data recovery software for external hard drive no matter how powerful functions it has.
Summarizing the above aspects, I recommend using MiniTool Power Data Recovery to perform external hard drive recovery. It contains five data recovery modules - Undelete Recovery, Damaged Partition Recovery, Lost Partition Recovery, Digital Media Recovery, CD & DVD Recovery. Each data recovery module focuses on different data loss scenario.
This is the main interface of the data recovery software. Here, we will recover lost data from damaged partition, so we select "Damaged Partition Recovery" module. Then, the following interface will appear.
Select the damaged partition and click "Open" button to view data.
If this data recovery software for external hard drive finds so many data, we can filter them with the help of the functions boxed with red line. Then, we can find desired data quickly and exactly. Next, check data which need recovering and click "Save Files" to save these data to an appointed safe place. After that, we can say we are successful to recover lost data from damaged partition in external hard drive.