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From: James Broadhead <jamesbroadhead@gmail.com>
Date: Mon, 31 Oct 2011 09:49:15 +0000
Message-ID: <CA+hid6HKuTYT9JypNkLELNQJzfFR9wzE_nopJzK=S=_2Fn4moQ@mail.gmail.com>
Subject: Re: [gentoo-user] Hard drive RPMs and data speed.
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On 27 October 2011 09:15, Dale <rdalek1967@gmail.com> wrote:
> Howdy,
>
> I'm wanting to get a hard drive that is pretty good size. =C2=A0I'm looki=
ng for
> about 1 to 2TBs or so. =C2=A0Thing is, a lot of them seem to be 5900 or e=
ven 5400
> rpm drives. =C2=A0I realize that the data on there is packed pretty tight=
so I
> want to ask a few people that may have one or more of these things a few
> questions. =C2=A0Are they as fast as a slower RPM drive? =C2=A0Would they=
be fast
> enough to play HD videos and such? =C2=A0I have quite a few 1080 HD video=
s. =C2=A0I
> don't want the drive to cause issues.
Ignoring your question somewhat, since the hdparm test won't actually
get you 'effective' throughput, only 'ideal'.
( (4.4*1024*1024*1024) / (120*60) ) / 1024
640.796
So a 4.4GiB movie that lasts 2 hours would require a sustained drive
throughput of 640KiB/s - which is pretty achievable.
My experience says that it doesn't matter how slow a drive you use,
provided that you beef up mplayer's cache size and minimum cache
threshold, since my laptop has a slow drive that likes to power down,
but loads of RAM.
>> grep cache /etc/mplayer/mplayer.conf
# cache settings
# Use 8MB input cache by default.
cache =3D 131072
# Prefill 20% of the cache before starting playback.
cache-min =3D 20.0
# Prefill 50% of the cache before restarting playback after the cache empti=
ed.
cache-seek-min =3D 50