SQLserver database files are completely deleted

Case:
User financial management software database was deleted and new data was covered

Solution:
The customer sent 3 hard disks equipped with a financial system. The previous database had been deleted, and then the new data was written. According to the engineer’s judgment on the bottom, according to the characteristic code comparison provided by the customer, the directory structure of the original database’s directory structure was found.It has been completely destroyed, but most of the data still exists. Engineers spend a lot of time using the rules of feature code and the bottom layer of the database to use software that specialize in extracting data records, which has successfully recovered most of the data records.