From owner-freebsd-current  Thu Oct  8 00:05:26 1998
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id AAA07536
          for freebsd-current-outgoing; Thu, 8 Oct 1998 00:05:26 -0700 (PDT)
          (envelope-from owner-freebsd-current@FreeBSD.ORG)
Received: from home.dragondata.com (home.dragondata.com [204.137.237.2])
          by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id AAA07513
          for <freebsd-current@freebsd.org>; Thu, 8 Oct 1998 00:05:19 -0700 (PDT)
          (envelope-from toasty@home.dragondata.com)
Received: (from toasty@localhost)
	by home.dragondata.com (8.8.8/8.8.5) id CAA10059;
	Thu, 8 Oct 1998 02:05:06 -0500 (CDT)
From: Kevin Day <toasty@home.dragondata.com>
Message-Id: <199810080705.CAA10059@home.dragondata.com>
Subject: Re: CDROM as system disk
In-Reply-To: <3.0.5.32.19981008085114.0091f220@mail.scancall.no> from Marius Bendiksen at "Oct 8, 98 08:51:14 am"
To: Marius.Bendiksen@scancall.no (Marius Bendiksen)
Date: Thu, 8 Oct 1998 02:05:05 -0500 (CDT)
Cc: freebsd-current@FreeBSD.ORG
X-Mailer: ELM [version 2.4ME+ PL31 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-current@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

> >Depending on if your delays between seeks are enough time for the drive to
> >spin down or not are a big factor. (spin down/spin up/seek/read is nasty)
> 
> How much work would it take to tweak the CDROM driver to wait 5-15 minutes
> (or, perhaps add an option somewhere, to make it dynamically configurable)
> before spinning down? I think that would solve some of the problem.
> 
> Of course, you'd probably need cooling if you're going to have a 32x at
> full spin all the time.
> ---
> Marius Bendiksen, IT-Trainee, ScanCall AS
> 

I don't believe that this is possible. The drive's firmware decides when to
spin up/down.

They spin down after only a few seconds because the drives seem to rip
themselves apart under constant use.

Heat also gets interesting in fast drives. :)

Kevin

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message