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Date:      Wed, 30 Sep 2020 14:59:32 +0200
From:      Christoph Kukulies <kuku@kukulies.org>
To:        Polytropon <freebsd@edvax.de>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: concluding from dd raw dump size to disk mfgr
Message-ID:  <F5976B86-7257-4507-A53C-4511674549D5@kukulies.org>
In-Reply-To: <20200930133550.24c382b6.freebsd@edvax.de>
References:  <876b79ff-b781-fede-a4de-cb58becd557c@kukulies.org> <20200930133550.24c382b6.freebsd@edvax.de>
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[-- Attachment #1 --]
Thanks. In my case I didn’t have physical access nor any access to the system I took the dd dump from.
I thought just to identify the drive from the calculation of the dump size.

But meanwhile I identified a device that fits and that probably must have the type of drive I took the dump from:

Toshiba MQ01ABF050



> Am 30.09.2020 um 13:35 schrieb Polytropon <freebsd@edvax.de>:
> 
> 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 
>> dump is exactly
>> 
>> 500107862016 bytes in size, corresponding to 997773168  sectors (512bytes).
>> 
>> I would like to dump this file back to a physical device. Best would be 
>> the one which fits exactly that size. Unfortunately I presently don't 
>> know what drive mfgr./type this corresponds to. Is there a way to find out?
> 
> 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


What is „AF“ devices?

> 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. :-)
> 
> 
--
Christoph



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