You don't have to be a criminal or a spy to want a truly clean drive
There is a little known command built into all modern drives firmware..... CMRR - Secure Erase
HDDerase.exe is a DOS-based utility that securely erases "sanitizes" all data
on ATA hard disk drives in Intel architecture computers (PCs). It offers the
option to run the drive internal secure erase command, security erase unit,
based on the ATA specification by the T13 technical committee.
This does not work on USB or SCSI drives.
It has been my understanding over the years of researching that the following refers to Bad Sectors as well..
Q: What is the difference between secure erase and enhanced secure erase?
A: Secure erase overwrites all user data areas with binary zeroes. Enhanced
secure erase writes predetermined data patterns (set by the manufacturer) to
all user data areas, including sectors that are no longer in use due to
reallocation. ***NOTE: the enhanced secure erase option is not supported by
all ATA drives.
No other software or method will also erase data on bad sectors.
So even if you erase a drive of data. Any data that was written to a sector that has
been marked bad can be recovered using exotic lab techniques for data recovery.
There are many devices now that are certified and can claim full certification for
things like HIPAA and other very sensitives data erasure needs that only use the
Internal Wipe Command to completely erase all data from a drive that could be
re-used in any capacity.
Which makes the Internal Wipe Command very favorable for anyone who is about to trash,
or resell a system that they may not want sensitive data to be recovered from.
Keep in mind that this is a full disk erasure.