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On 2016-09-30 14:14, nishiwak...@gmail.com wrote:
> Hi,
> 
> Could a Qubes developer pay attention on this ticket, please ?
> 
> I can't reinstall any other OS than Qubes on my HDD. When I put in a USB key, 
> it doesn't boot on it, it switches directly to the GRUB menu.
> 

You have to select your USB key as the first boot option in your BIOS menu. 
Alternatively, invoke the boot selection menu during boot, and choose your USB 
key. How to do this depends on your BIOS.

> I am sure at 100% it comes from some sort of disk protection that Qubes put 
> on my disk. I am also sure that those USB keys would work on any other HDDs, 
> as they are properly burnt.
> 

Qubes does not create or apply any "disk protection" of that sort.

> I tried to reinstall Qubes without disk encryption. It didn't change the 
> outcome.
> 
> How do I remove this disk block so I can use USB keys to install another OS 
> than Qubes ?

If you want to make sure the disk is empty, you can simply zero-fill it, e.g.,

  # dd if=/dev/zero of=/dev/sdX

where sdX is your disk. (Make sure not to select just a single partition on the 
disk, but rather the whole disk.)

There are also other methods, like ATA Secure Erase (hdparm). Have a read:

https://wiki.archlinux.org/index.php/Securely_wipe_disk

- -- 
Andrew David Wong (Axon)
Community Manager, Qubes OS
https://www.qubes-os.org
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