Remanent Magnetization
When you store a data on your hard drive you magnetize it in a certain way that operating system understands.
At the beginning, when you format your disks, your Operating System creates a special map on your hard drive with tracks and sectors.
This map is called File System. Your operating System then uses File System to know where it stored what file and folder.
When you delete a file or folder, the area around the place where your data was stored still has some memory called
Remanent Magnetization.
The remanent magnetization is the permanent magnetization that remains after the
magnetization of the original track is changed to zero (data wiped).
Analyzing the Remanent Magnetization helps
some data recovery software programs to recover
the wiped data.
We use a complex data manipulation to make sure that
remanent magnetization does not have a trace of your sensitive data.