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Re: Trouble making bootable USB from ISO image




On 2019-05-04, Mark Fletcher <mark27q1@xxxxxxxxx> wrote:
> On Fri, May 03, 2019 at 12:54:17PM -0400, Greg Wooledge wrote:
>> On Sat, May 04, 2019 at 01:50:31AM +0900, Mark Fletcher wrote:
>> > it auto-mounted.
>> 
>> > So as root I did:
>> > 
>> > cp <ISO file> /dev/sdf
>> 
>> You need the device NOT to be mounted when you do the cp.  This may mean
>> you have to turn off your auto-mounter, or (better still) just log out of
>> your Desktop Environment entirely, and log in as root on a text console
>> for this operation.

I'm intervening here merely to point out that just because the user's
external usb device is auto-mounted does not mean that said device
cannot be unmounted by the usual methods (at least I have yet to
encounter Greg Wooledge's auto-mounter from Hell that will not permit
it). 

>> If the device is mounted, that will interfere with the raw byte writing
>> you're doing.  The results are unpredictable.
>> 
>
> This makes sense to me; confession time -- I originally ejected the pen 
> drive when Gnome auto-mounted it, but then found I couldn't do anything 
> with the device at all, so concluded that contrary to my memory it 
> needed to be mounted. Web pages I'd found said nothing about unmounting 
> the device before writing, so again I thought my memory was faulty. What 
> I failed to consider was the difference between unmounting and ejecting.
>

-- 
The boys at first were very polite about my medals and asked me what I had done
to get them. I showed them the papers, which were written in very beautiful
language and full of fratellanza and abnegazione, but which really said, with
the adjectives removed, that I had been given the medals because I was 
an American. - "Another Country"