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Date:      Mon, 25 Apr 2011 22:15:57 -0400
From:      Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com>
To:        Bartosz Fabianowski <freebsd@chillt.de>
Cc:        Torfinn Ingolfsen <torfinn.ingolfsen@broadpark.no>, freebsd-stable@freebsd.org
Subject:   Re: System extremely slow under light load
Message-ID:  <BANLkTimrSznAGJhC6FrepXpacXiEj-EMwA@mail.gmail.com>
In-Reply-To: <4DB60274.60701@chillt.de>
References:  <4DB4589B.2020909@ksu.ru> <4DB45D6C.20203@chillt.de> <20110424182456.9DD03589@server.theusgroup.com> <4DB46ED4.2010500@chillt.de> <20110425004818.GA22579@icarus.home.lan> <4DB51F27.5010508@chillt.de> <20110425184728.C73992@sola.nimnet.asn.au> <4DB56CDA.50504@chillt.de> <20110425232429.N85801@sola.nimnet.asn.au> <4DB57F45.4080107@chillt.de> <20110425141643.GA38380@icarus.home.lan> <4DB583E9.8080507@chillt.de> <20110425234117.d1476c95.torfinn.ingolfsen@broadpark.no> <4DB60274.60701@chillt.de>

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On Mon, Apr 25, 2011 at 7:23 PM, Bartosz Fabianowski <freebsd@chillt.de>wrote:

> Have you tried just using dd to copy the iso image of a Ubuntu / Linux
>> LiveCD to a suitably sized USB memory stick?
>> It has worked for me in the past.
>>
>
> As per Mehmet's tip, I did just that with a Debian image. If it works for
> Ubuntu images as well then I really wonder why the only documented way is
> via Unetbootin.
>
> - Bartosz
> _______________________________________________
>


To reduce the number of files to maintain , some Linux distributions started
to generate .iso files both for CD/DVD burning  and USB stick dd copying .
Such distributions are mostly called "dual" or "hybrid" in their names with
.iso extension to distinguish them from only CD/DVD burning .iso files .

If an .iso is named for USB without "dual" or "hybrid" names , it is very
likely that it is prepared in such a way for USB dd copying .

With respect to my opinion , most .iso files which they are prepared for
CD/DVD burning will be able to boot and install from dd copied USB sticks
because .iso is a FILE format , NOT a DEVICE format .

The problem is not the file format but the ability of the operating system
to use devices . For example , I am seeing operating systems in CD , they
are booting from DVD drive ( because BIOS is loading their kernel , etc. )
but failing to install because their kernels , etc. are NOT able to use the
DVD drive when they are taking the control of the PC .


Thank you very much .

Mehmet Erol Sanliturk



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