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Re: Raspberry Pi 1Tbyte hard drive kit

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On 12/09/2015 11:41, James Harris wrote:
>
> "David Taylor" <david-taylor@blueyonder.co.uk.invalid> wrote in message
> news:mt0947$irb$1@dont-email.me...
>
> ..
>
>> Actually, when testing with PCs I have found that USB 3.0 devices
>> often perform faster than USB 2.0 devices even when plugged into the
>> sane USB 2.0 port.  Perhaps they are faster internally, perhaps there
>> is less overhead in the interface, or whatever.   Speed tests can and
>> do show an advantage.  Check for yourself.
>
> Do you have a particluar way of doing such speed tests or a certain
> piece of software that you trust to give good figures?
>
> I ask because I don't think a simple data transfer is enough. IME the
> speed of a disk varies a lot between outer and inner cylinders. For
> example,
>
>   http://miscel.wikidot.com/disk-throughput
>
> That particular disk averaged (using long 1-minute averages) about
> 80Mbyte/s on the outer cylinders and 40Mbyte/s on the inner. So SDTRs
> (sustainable data transfer rates) can vary by a factor of 2 depending
> simply on which part of the disk surface is being accessed.
>
> Added to that, short-term averages could show figures significantly
> higher or lower as they interact with things like the disk drive's
> inbuilt buffer memory, how a file is laid out on disk (the above graph
> was from disk-order sector access), other loads, remapped sectors, and
> drive autonomous operations.
>
> James

James, I use this software - h2testw:

   http://www.heise.de/download/h2testw.html

It does large file transfers, but is primarily designed to check that a 
32 GB memory card really has 32 GB and is not a remarked rip-off.  Quite 
accept what you say about large versus small transfers, random versus 
sequential etc.

For HD testing I have used HD tune 2.55, so I appreciate speed the 
difference between different regions of an HD.

Most of my testing has been with SD cards, and a few USB memory sticks, 
but moving to USB 3.0 on both device and PC interface has made HD 
transfers (backups or large Zip files generated nightly on a PC), and SD 
card reading (out of the camera, getting pictures onto a PC) a lot quicker.

-- 
Cheers,
David
Web: http://www.satsignal.eu

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Raspberry Pi 1Tbyte hard drive kit "James Harris" <james.harris.1@gmail.com> - 2015-09-10 22:56 +0100
  Re: Raspberry Pi 1Tbyte hard drive kit ray carter <ray@zianet.com> - 2015-09-10 22:24 +0000
    Re: Raspberry Pi 1Tbyte hard drive kit mrbrad <lostgonzo@gmail.com> - 2015-09-10 23:36 -0500
      Re: Raspberry Pi 1Tbyte hard drive kit mrbrad <lostgonzo@gmail.com> - 2015-09-19 23:23 -0500
        Re: Raspberry Pi 1Tbyte hard drive kit rickman <gnuarm@gmail.com> - 2015-09-20 00:42 -0400
          Re: Raspberry Pi 1Tbyte hard drive kit mrbrad <lostgonzo@gmail.com> - 2015-09-20 01:56 -0500
    Re: Raspberry Pi 1Tbyte hard drive kit mm0fmf <none@mailinator.com> - 2015-09-11 18:13 +0100
      Re: Raspberry Pi 1Tbyte hard drive kit "James Harris" <james.harris.1@gmail.com> - 2015-09-11 18:19 +0100
        Re: Raspberry Pi 1Tbyte hard drive kit mm0fmf <none@mailinator.com> - 2015-09-11 20:05 +0100
          Re: Raspberry Pi 1Tbyte hard drive kit rickman <gnuarm@gmail.com> - 2015-09-11 17:55 -0400
          Re: Raspberry Pi 1Tbyte hard drive kit "James Harris" <james.harris.1@gmail.com> - 2015-09-12 00:05 +0100
            Re: Raspberry Pi 1Tbyte hard drive kit David Taylor <david-taylor@blueyonder.co.uk.invalid> - 2015-09-12 05:21 +0100
              Re: Raspberry Pi 1Tbyte hard drive kit "James Harris" <james.harris.1@gmail.com> - 2015-09-12 11:41 +0100
                Re: Raspberry Pi 1Tbyte hard drive kit David Taylor <david-taylor@blueyonder.co.uk.invalid> - 2015-09-12 13:17 +0100
                Re: Raspberry Pi 1Tbyte hard drive kit Rob Morley <nospam@ntlworld.com> - 2015-09-12 15:28 +0100
            Re: Raspberry Pi 1Tbyte hard drive kit mm0fmf <none@mailinator.com> - 2015-09-12 08:22 +0100
              Re: Raspberry Pi 1Tbyte hard drive kit rickman <gnuarm@gmail.com> - 2015-09-12 03:30 -0400
            Re: Raspberry Pi 1Tbyte hard drive kit Mike Fleming <{mike}@tauzero.co.uk> - 2015-09-12 09:02 +0100
              Re: Raspberry Pi 1Tbyte hard drive kit mm0fmf <none@mailinator.com> - 2015-09-12 09:11 +0100
                Re: Raspberry Pi 1Tbyte hard drive kit rickman <gnuarm@gmail.com> - 2015-09-12 04:19 -0400
  Re: Raspberry Pi 1Tbyte hard drive kit David Taylor <david-taylor@blueyonder.co.uk.invalid> - 2015-09-11 07:21 +0100
    Re: Raspberry Pi 1Tbyte hard drive kit "James Harris" <james.harris.1@gmail.com> - 2015-09-16 18:59 +0100
      Re: Raspberry Pi 1Tbyte hard drive kit ray carter <ray@zianet.com> - 2015-09-16 19:23 +0000
  Re: Raspberry Pi 1Tbyte hard drive kit rickman <gnuarm@gmail.com> - 2015-09-11 13:30 -0400
    Re: Raspberry Pi 1Tbyte hard drive kit "James Harris" <james.harris.1@gmail.com> - 2015-09-16 19:02 +0100
      Re: Raspberry Pi 1Tbyte hard drive kit rickman <gnuarm@gmail.com> - 2015-09-16 14:23 -0400
        Re: Raspberry Pi 1Tbyte hard drive kit "James Harris" <james.harris.1@gmail.com> - 2015-09-16 19:42 +0100
          Re: Raspberry Pi 1Tbyte hard drive kit rickman <gnuarm@gmail.com> - 2015-09-16 15:37 -0400
            Re: Raspberry Pi 1Tbyte hard drive kit "James Harris" <james.harris.1@gmail.com> - 2015-09-16 20:54 +0100
              Re: Raspberry Pi 1Tbyte hard drive kit rickman <gnuarm@gmail.com> - 2015-09-16 16:41 -0400
          Re: Raspberry Pi 1Tbyte hard drive kit Martin Gregorie <martin@address-in-sig.invalid> - 2015-09-16 19:42 +0000
            Re: Raspberry Pi 1Tbyte hard drive kit "James Harris" <james.harris.1@gmail.com> - 2015-09-16 21:06 +0100
              Re: Raspberry Pi 1Tbyte hard drive kit Martin Gregorie <martin@address-in-sig.invalid> - 2015-09-16 21:19 +0000

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