Gentoo Archives: gentoo-user

From: Nikos Chantziaras <realnc@×××××.de>
To: gentoo-user@l.g.o
Subject: [gentoo-user] Re: Hard drive RPMs and data speed.
Date: Thu, 27 Oct 2011 10:11:44
Message-Id: j8bake$m62$
In Reply to: [gentoo-user] Hard drive RPMs and data speed. by Dale
1 On 10/27/2011 11:15 AM, Dale wrote:
2 > Howdy,
3 >
4 > I'm wanting to get a hard drive that is pretty good size. I'm looking
5 > for about 1 to 2TBs or so. Thing is, a lot of them seem to be 5900 or
6 > even 5400 rpm drives. I realize that the data on there is packed pretty
7 > tight so I want to ask a few people that may have one or more of these
8 > things a few questions. Are they as fast as a slower RPM drive?
10 I assume you meant to say "as fast as a faster RPM drive". No, of
11 course not. If we're speaking about the same capacity and amount of
12 platters, of course. If we're not, then yes, they can be as fast
13 because of the higher data density.
16 > Would
17 > they be fast enough to play HD videos and such? I have quite a few 1080
18 > HD videos. I don't want the drive to cause issues.
20 The transfer speed required for playing HD videos is virtually zero.
21 1080p video compressed using an 8mbps rate require 2MB/s. This can be
22 done even with the slowest drive from 10 years ago. Today's slowest
23 drive are able to play about 40 or 50 of those HD video simultaneously.
24 So the answer is yes. They can play HD video :-)
26 Most of those 5900/5400 disks are meant for pure data storage. The
27 lower RPM is used to market them as "green and silent", meaning they
28 don't consume much power and aren't noisy. Installing your OS on them
29 though isn't going to give you good speed. They have good transfer
30 rates, but their access times usually suck.
33 > Can someone that has one or more of these post their hdparm -Tt results?
34 > Different speeds would be great too. I'd like to compare what a 5400rpm
35 > drive would do compared to a 7200rpm drive.
37 Simply Google around for benchmarks of the drivers you're interested in.
38 Note that is in area where it doesn't make any real difference that
39 the benches or reviews you find are performed under MS Windows. The
40 results are applicable to every OS.
42 As a rule of thumb when buying drives: if you want to install software
43 on it, buy an 7200RPM drive with good access times. Of course they're
44 more expensive If you just want to store all your downloaded HD porn
45 and music collection on it, a silent 5400RPM drive is a good choice.
47 Oh, and one other thing; hdparm is only meant to get you the continuous
48 I/O transfer rate. It's an awful benchmark for anything else, like what
49 happens if a file is fragmented or how fast it can copy/write data
50 spread around the disk, how good it is at combined random I/O operation,
51 etc.


Subject Author
Re: [gentoo-user] Re: Hard drive RPMs and data speed. Michael Mol <mikemol@×××××.com>
Re: [gentoo-user] Re: Hard drive RPMs and data speed. Volker Armin Hemmann <volkerarmin@××××××××××.com>