To erase a 64-bit installation you’ll need to run it from a bootable flash drive, CD, or floppy. Hdderase.exe will run under any 32-bit version of Windows, but as a 16-bit program, it won’t run under 64-bit installations.
You can also boot with a Linux distribution with hdparm installed and use that command-line utility. You’ll need to hit up your vendor for a tool, or check out Parted Magic and its DriveEraser utility. Also, if your drive’s security is in a frozen state (most these days are to prevent access by malware), then hdderase.exe won’t work. How they could back-door a utility like this is beyond me, but I’m putting it out there. One is that the NSA sponsored its development. There are several possible flies in the hdderase.exe ointment. Utilities from drive vendors now do this, but you can also employ a free, old-school, command-line utility from the data experts at the University of California San Diego called HDDerase.exe. If you want to re-use a hard or solid state drive, but want to make sure that possibly sensitive data from its previous life isn’t still hanging around, the easiest way to do it is invoke the ATA secure erase command-a feature built into every drive manufactured since 2001.
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