What you have demonstrated is that you are ill-equipped to deal with issues of privacy or data security.

The recommended approach is to drop down to low-level. Issue a drive-erase command (there exist software to that purpose). Before reusing the drive, one ought to scan for badblocks and/or smart test. These operations take hours, possibly more that day with modern HDDs.

The best, most reliable way to provide security is to melt/shred/demagnetize the drive in industrial setting. You can substitute this process with a more affordable Hammer Method. That, too, may take hours to accomplish the objective but might be considered a good workout.

In reply to Re: Create text files recursively and write ZEROS within them all - data overwriting purposes by Anonymous Monk
in thread Create text files recursively and write ZEROS within them all - data overwriting purposes by panicbuttonsec

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