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Date:   Thu, 2 Aug 2018 13:29:56 +0100
From:   Alan Cox <gnomes@lxorguk.ukuu.org.uk>
To:     Jeff Chua <jeff.chua.linux@gmail.com>
Cc:     Ming Lei <tom.leiming@gmail.com>,
        lkml <linux-kernel@vger.kernel.org>
Subject: Re: How to secure erase PCI-E NVME SSD connected via USB3?
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> # hdparm --user-master u --security-erase p /dev/sda
> (returns immediately and does nothing).
> 
> I've tried hdparm on an SSD connected via USB3 and it secure-erased ok.
> 
> Anyone working on this?

Sounds to me like you need to contact the vendor of the interface in
question. If it accepted a security erase command and didn't do it then
it's broken. It's at liberty to refuse it, or report it doesn't know what
you are talking about, but if it just returned and after re-plugging the
device its still using the old keys then it or the device is busted and
it's not something the OS can do much about.

Alan