From: Brad Campbell <lists2009@fnarfbargle.com>
To: Wols Lists <antlists@youngman.org.uk>
Cc: linux-raid@vger.kernel.org
Subject: Re: Implementing Global Parity Codes
Date: Tue, 30 Jan 2018 22:18:34 +0800 [thread overview]
Message-ID: <867daa46-ac15-a0a2-8809-89af882ad3a4@fnarfbargle.com> (raw)
In-Reply-To: <5A6F5D9B.5060201@youngman.org.uk>
On 30/01/18 01:44, Wols Lists wrote:
> Except that most drives don't do that nowadays, they do "constant linear
> velocity" so the drive speeds up or slows down depending on where the
> heads are, I believe.
No. Hard disks have one speed. That can be easily proven by popping the
top off and putting a tacho on the spindle, or just looking at any
linear read benchmark as they all demonstrate that data transfer slows
down as the head works its way towards the spindle.
Same reason the first couple of tracks on each LP sounded better. More
vinyl to get a better response.
Optical disks used CLV where they needed to get bits out at a specific
clock rate (ie Audio).
Brad.
next prev parent reply other threads:[~2018-01-30 14:18 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-27 5:47 Implementing Global Parity Codes mostafa kishani
2018-01-27 8:37 ` Wols Lists
2018-01-27 14:29 ` mostafa kishani
2018-01-27 15:13 ` Wols Lists
2018-01-28 13:00 ` mostafa kishani
2018-01-29 10:22 ` David Brown
2018-01-29 17:44 ` Wols Lists
2018-01-30 11:47 ` David Brown
2018-01-30 14:18 ` Brad Campbell [this message]
2018-01-30 11:30 ` mostafa kishani
2018-01-30 15:14 ` David Brown
2018-01-31 16:03 ` mostafa kishani
2018-01-31 17:53 ` Piergiorgio Sartor
2018-02-02 5:24 ` NeilBrown
2018-02-03 6:01 ` mostafa kishani
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