Data deletion while using wear leveling FatFS

[seaduck13]

Hi,
I'm working on a project where I need to be able to completely erase any evidence of certain file data on the FS. I'm implementing the wear-leveling FatFS, but I can't seem to figure out how to completely delete/erase the data. I assume that using a simple delete command just erases the pointer in the file system and opens the sectors to be written over at a future time. Is it feasible to write over all the bits with 0's and 1's before erasing the pointer, similar to formatting, or will modifications be stored in a separate location due to wear leveling?

Any information on this would be great. Thank you!

[WiFive]

I suspect you would need a secure erase command and then the question becomes what is the best way to secure erase nor flash. But would flash encryption and secure boot not be enough protection or are you worried about an application level exploit?