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Date: Thu, 11 Aug 2011 10:30:04 -0700
Message-ID: <CAK2H+ee=4KYW8ugyNUS3z+NUdYJLiqejpsd4bePg2pXCaPFqow@mail.gmail.com>
Subject: Re: [gentoo-user] {OT} USB 3.0 hard drive speed test
From: Mark Knecht <markknecht@gmail.com>
To: gentoo-user@lists.gentoo.org
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On Thu, Aug 11, 2011 at 10:12 AM, Grant <emailgrant@gmail.com> wrote:
> I'm testing this USB 3.0 bus-powered hard drive:
>
> http://www.amazon.com/gp/product/B0041OSQ9S
>
> and I get:
>
> # hdparm -tT /dev/sdb
> /dev/sdb:
> Timing cached reads: =C2=A0 8006 MB in =C2=A02.00 seconds =3D 4004.33 MB/=
sec
> Timing buffered disk reads: 252 MB in =C2=A03.01 seconds =3D =C2=A083.63 =
MB/sec
>
> # hdparm -tT /dev/sdb
> /dev/sdb:
> Timing cached reads: =C2=A0 8230 MB in =C2=A02.00 seconds =3D 4116.54 MB/=
sec
> Timing buffered disk reads: 252 MB in =C2=A03.02 seconds =3D =C2=A083.55 =
MB/sec
>
> # hdparm -tT /dev/sdb
> /dev/sdb:
> Timing cached reads: =C2=A0 8446 MB in =C2=A02.00 seconds =3D 4224.36 MB/=
sec
> Timing buffered disk reads: 230 MB in =C2=A03.02 seconds =3D =C2=A076.28 =
MB/sec
>
> Wikipedia says USB 3.0 has transmission speeds of up to 5 Gbit/s.
> Doesn't MB/sec denote mega*bytes* per second?
>
> - Grant

4000MB/s =3D 4Gb/s