And let me guess, that OS fell from the skies, right? Please, get to grips, this question is way, way above your abilities and you're giving an uninformed advice that can be potentially dangerous, if anyone took it for granted. Controller chips can be manipulated and reserved space accessed. On certain memory chips (such as MLC that are now most often used due to affordability and storage space they offer), even multiple write operations on a single cell can be read back with specialized hardware. It's a bit like multi-layer optical disks where user can only access the top layer. —
TildalWave 3 mins ago