USB 2.0 external hard drive only 1.000MB/s transfers

[Chris Richards]

Hi,
 
Here is the output with the different block size.
 
root at spunky2:~$ dd if=/dev/da0 of=/dev/null bs=64000
^C4262+0 records in
4262+0 records out
272768000 bytes transferred in 269.048179 secs (1013826 bytes/sec)
 
Thanks.
 
-Chris

________________________________

From: owner-freebsd-usb at freebsd.org on behalf of Hans Petter Selasky
Sent: Sun 18/09/2005 9:05 PM
To: freebsd-usb at freebsd.org
Subject: Re: USB 2.0 external hard drive only 1.000MB/s transfers



On Friday 16 September 2005 08:45, Hans Petter Selasky wrote:
> On Thursday 15 September 2005 14:01, Chris Richards wrote:
> > Hi,
> >
> > I bought a USB 2.0 external hard drive and USB 2.0 PCI card to use for
> > backups on my FreeBSD box but the drive is recognised as only being able
> > to do 1.000MB/s transfers. Obviously a USB 2.0 drive should be able to
> > transfer data a lot faster... I have checked my config and can't see any
> > issues.
> >
> > Can someone point me in the right direction or see an issue with my
> > config? I have included a "dmesg" and "kernel config" below.
> >
> > Thank you in advance for your help.
> >
> > Cheers.
> >
> > -Chris
>
> The umass driver does not display the right number. What does
> "dd if=/dev/daXXX of=/dev/null" show ?

The speed depends very much on the block size used:

Also try this:

dd if=/dev/da0 of=/dev/null bs=64000

--HPS
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