Mailinglist Archive: opensuse (1556 mails)

[Herbert Graeber <hgraeber@xxxxxxxxxxxx>]

Am 03.02.2010 10:52, schrieb Sampsa Riikonen:
> [...]
>
> I am trying to do a backup using
>
> dd if=/dev/sda of=/dev/sdb
>
> [...]
> What I read from wikipedia, the speed of that is..
>
> 60 Mbytes (not bits) per second ~ 0.06 Gbytes per second
>
> So this means that a 500 Gbytes hard disk should copy in aprox. 2.3 hours
>
> .. but know it seems it takes more than 24 hours!
>
> What seems to be the problem?  Am I missing something in the math?
>   
Yes, you have to use a larger block size "dd if=/dev/sda of=/dev/sdb
bs=1M" should speed up your backup.
> My external usb hard disk box has also an option to use an esata connector
> (but then I should buy an adaptor to my laptop), but the speed difference
> to usb 2.0 is not that big, I imagine..?
>   
As far as I know esata can be much faster, but to get the higher speed,
you have to use larger block sizes, too.

Herbert

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