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Date:	Thu, 25 May 2023 11:03:42 +0200
Message-ID:	<CAERDJOGrFWS-nMVO_NVQJfYexjcCASH4xpQwb+RtKQXANTZWvg@mail.gmail.com>
Subject:	dd: error reading '/proc/sys/Device/HarddiskVolumeShadowCopy9': No
	space left on device
To:	cygwin AT cygwin DOT com
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From:	Opty via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Opty <opty77 AT gmail DOT com>
Sender:	"Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

Hello,

I'm trying to create a volume shadow copy image using

$ dd if=/proc/sys/Device/HarddiskVolumeShadowCopy9 of=/dev/null
bs=4096 status=progress

but it ends prematurely with

116923437056 bytes (117 GB, 109 GiB) copied, 65 s, 1.8 GB/s
dd: error reading '/proc/sys/Device/HarddiskVolumeShadowCopy9': No
space left on device
29139072+0 records in
29139072+0 records out
119353638912 bytes (119 GB, 111 GiB) copied, 65.5664 s, 1.8 GB/s

If i use Windows Command Prompt then it finishes successfully:

C:\tmp>\cygwin64\bin\dd
if=//?/GLOBALROOT/Device/HarddiskVolumeShadowCopy9 of=/dev/null
bs=4096 status=progress
119288205312 bytes (119 GB, 111 GiB) copied, 471 s, 253 MB/s
29139074+0 records in
29139074+0 records out
119353647104 bytes (119 GB, 111 GiB) copied, 471.14 s, 253 MB/s

If I use count=29139071 then it works in both environments.

Any ideas?

I haven't subscribed yet so Cc me please.

Regards,
Opty

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