Your problem is mainly caused by system error. But please relax a little bit. You have a great chance to recover data from SimpleTech external hard drive before you decide to format it. Here is my advice: do not format your drive before you find a reliable SimpleTech data recovery program to retrieve your lost files
Recoverit data recovery is a very good option for you to recover data from SimpleTech external hard drive, no matter data was lost because of formatting, deletion, system error, or other reasons. This trustful tool helps you recover almost every lost file from your SimpleTech external hard drive, including pictures, documents, videos, archive files, audio files, and more.
I’ll show you how to recover lost files from your SimpleTech external hard drive with Recoverit Data Recovery for Windows. If you are a Mac user, you can also follow similar operations with the Mac version of the program.
Select the drive letter of your SimpleTech external hard drive and click "Start" to begin scanning lost files on it.
Recoverit data recovery will start a quick scan. If files on your SimpleTech external hard drive are lost because of formatting, you’ll need to scan again with "All-around Recovery" after the quick scan.
All found files on your SimpleTech external hard drive will be displayed in the window after scanning. You just need to mark files you want to retrieve and click "Recover" button to save them on your computer’s partition.