Could you perhaps try with ddrescue for me please (also has a block size
option)? I could try and reproduce myself but without the email thread
that will be a challenge.

Hamish

On 14/09/2020 17:32, Jason Pyeron wrote:
>> -----Original Message-----
>> From: Erik Soderquist
>> Sent: Monday, September 14, 2020 11:55 AM
>> Subject: [cygwin] Re: DD bug fails to wipe last 48 sectors of a disk
>>
>> On Mon, Sep 14, 2020 at 11:45 AM Hamish McIntyre-Bhatty via Cygwin wrote:
>>> Was this ever resolved? I could have sworn I saw some discussion about
>>> this but I can't find it in the archives.
>> I still have the thread in my local email; a couple viable work
>> arounds were provided, but the issue's root cause is on the Windows
>> side, so I believe the only real route to a true fix would be via
>> Microsoft altering their code.
> When accessing with proper (aligned) block size and count I do not encounter the problem - happy to test again.
>
>>> It might also affect ddrescue, I feel.
>> I believe you are accurate in this feeling.
>
>
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