Deleting hard disk entirely, from Unix

[cool11]

I understand all these thing you told me, I appreciate it.
What impress me, is that it seems to me that I followed a procedure (/sbin/mount -uw / and rm -rf /*) that does not have predictable results.

In the vast majority of cases in other problems, a user do something and then we expect usually a specific result.

It impress me the fact that I run the commands, and the only way to be sure what really going on, is to get the disk out of the machine etc

I thought that the results where more predictable and more specific, and not 'make this and only God knows what it will take place'.

I thought that in almost any computer action we have to expect specific results but maybe I am wrong. Maybe I am wrong.

 

[chrfr]

It impress me the fact that I run the commands, and the only way to be sure what really going on, is to get the disk out of the machine etc

The "rm" command is doing exactly as it should. Nobody here can verify that your files are gone because we don't have access to your computer.
The issue is that you're trying to do something which should be done a different way. The only correct way to delete everything on a disk is to format it. Also note that file recovery from the "rm" command is trivial so it should be assumed that anyone buying your computer could recover your data if they wish.

I asked this earlier but didn't get an answer: does this computer boot into internet recovery mode?

 

[cool11]

No, it does not boot into internet recovery mode.