From owner-freebsd-questions@freebsd.org  Fri Mar 17 21:21:34 2017
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Date: Fri, 17 Mar 2017 15:21:28 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Bertram Scharpf <lists@bertram-scharpf.de>
cc: freebsd-questions@freebsd.org
Subject: Re: Second severe crash in six weeks
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On Fri, 17 Mar 2017, Bertram Scharpf wrote:

> On Friday, 17. Mar 2017, 13:56:54 -0600, Warren Block wrote:
>> On Fri, 17 Mar 2017, Bertram Scharpf wrote:
>>
>>> On Thursday, 16. Mar 2017, 08:59:44 +0000, Matthew Seaman wrote:
>>>> On 15/03/2017 22:22, Bertram Scharpf wrote:
>>>
>>>  # dd if=/dev/zero of=usbstick.img bs=1M count=7552
>>
>> A count should not be necessary, it will stop when it runs out of input.
>
> The file name is "usbstick.img" but it is still a file. The
> count is the length of the USB stick I'm planning to dd to.

This is still not needed.  Either it will run out of file and end, or 
try to go past the end of a too-small memory stick and end.  Come to 
that, I'm not sure what it does when the bs and count are larger than 
the size of the file.  Probably just end when it runs out of input.