All that has been said on this thread supposes that the hard drive is still 
readable and writable.

But the original post stated this was a failed drive.

Then you might not be able to dd if=/dev/zero of=/dev/sdx .. or whatever else.

You would be stopped by bad sectors.

Or a hard drive might not be accessible at all through the computer interface.

I heard something that sounded like a modem dialing, but had no such modem.  

Going around with my eyes and ears led me to determine that it was a hard drive 
whining in an external eSATA enclosure, no longer recognized or accessible from 
the computer.

That was a Western Digital Green 3 TB hard drive that replaced, under warranty, 
a WD Green 3 TB hard drive that developed bad sectors.

Fortunately I had no confidential data on that hard drive.

So everything in this thread says nothing about if the hard drive failed due to 
a mechanical problem.

Then the data could not be overwritten by ordinary means, but could still be 
read by techniques such as used by Drive Savers.

Tom


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