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Date: Wed, 24 Jun 2020 13:21:26 +0300
From: Andrey Repin <anrdaemon AT yandex DOT ru>
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To: Hashim Aziz <hashaziz AT hotmail DOT com>, cygwin AT cygwin DOT com
Subject: Re: [cygwin] DD bug fails to wipe last 48 sectors of a disk
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Greetings, Hashim Aziz!

Bottom posting in this channel, please.

> I've just tested with the command:

> dd if=/dev/zero of=/dev/sda iflag=fullblock bs=4M status=progress

oflag=direct

Although I'm unsure how Cygwin/Windows handles it. But without this flag, the
write is cached, and the problem may be outside dd, or even Cygwin.

> ...and can confirm that the last 48 sectors remain unwiped in this case also.

> Here is the output:

> 1000182120448 bytes (1.0 TB, 931 GiB) copied, 8284 s, 121 MB/s
> dd: error writing '/dev/sda': No space left on device
> 238468+0 records in
> 238467+0 records out
> 1000204861440 bytes (1.0 TB, 932 GiB) copied, 8284.89 s, 121 MB/s


-- 
With best regards,
Andrey Repin
Wednesday, June 24, 2020 13:19:42

Sorry for my terrible english...

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