what is the recommended command/app to secure the free space and make them unrecoverable ?
if the disk is encrypted. does i still need to secure the free space and to secure how i delete file or not?
let say disk was encrypted then i reformat the whole disk can the data be recovered? and if does is it will be like encrypted files so if i have the key it can recover the file to it unencrypted form ?
where the keys stored ? if i removed that key would it be unrecoverable ?
sorry for my confusing about those stuff and thanks for your time and help