From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Brown Subject: Re: Is this enough for us to have triple-parity RAID? Date: Wed, 25 Apr 2012 21:29:46 +0200 Message-ID: <4F9850AA.4000002@hesbynett.no> References: <4F91142C.80305@hardwarefreak.com> <4F97515D.8000406@hardwarefreak.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Emmanuel Noobadmin Cc: Alex , stan@hardwarefreak.com, linux-raid@vger.kernel.org List-Id: linux-raid.ids On 25/04/12 18:59, Emmanuel Noobadmin wrote: > On 4/25/12, Alex wrote: >> I can see that you are trying very hard to fit a new picture into an old >> frame. But with new technology there is always new possibilities. For >> example, what I am thinking is: with the new laser write head, it doesn't >> necessarily require the head to stay very close to the platter since laser >> doesn't fade away with longer distance, which may enable a design that > > The strength of the laser will fall as the distance to the media > increases, wouldn't it? > The laser's strength will only fade very slightly. It is not passing through enough air to significantly attenuate, and one of the points of using a laser is that you can focus it into a very tightly linear beam. So you are right in theory, but wrong in practice.