Actually it was an SSD, and naturally I meant -after I had lost Luks drive encryption key.
As most of you already know. If one is trying to install another OS to the drive, which has Luks encryption, the disc drive Partition er demands the Password. And will not one write over the drive.
I realize most of you know a clever way to do this. but I did it ugly.
I had Windows 10 Install on a USB key. Windows does not notice Luks encryption of drive, and simply writes over disc.
Then, of course a Linux install will happily install to the drive. I hope re writing the boot area of the drive.
and I was only testing out Pure some months back, I had nothing private on drive, which is why I was not careful keeping up with password.