Date: Wed, 30 Sep 2020 13:35:50 +0200 From: Polytropon <freebsd@edvax.de> To: Christoph Kukulies <kuku@kukulies.org> Cc: freebsd-questions@freebsd.org Subject: Re: concluding from dd raw dump size to disk mfgr Message-ID: <20200930133550.24c382b6.freebsd@edvax.de> In-Reply-To: <876b79ff-b781-fede-a4de-cb58becd557c@kukulies.org> References: <876b79ff-b781-fede-a4de-cb58becd557c@kukulies.org>
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On Wed, 30 Sep 2020 09:40:00 +0200, Christoph Kukulies wrote: > I made a dd dump of a raw disk device the other day. The size of the=20 > dump is exactly >=20 > 500107862016 bytes in size, corresponding to 997773168=A0 sectors (512byt= es). >=20 > I would like to dump this file back to a physical device. Best would be=20 > the one which fits exactly that size. Unfortunately I presently don't=20 > know what drive mfgr./type this corresponds to. Is there a way to find ou= t? A convenient way is to use the following command: # diskinfo -v <device> Also check the corresponding entry in the "dmesg" output. Note that AF devices might prefer a sector size of 4kB (4039 instead of 512 bytes). When you transfer data back using dd, you can often choose a better suited block size, usually in the range of several MBs. :-) --=20 Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...
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