On Sun, 09 Apr 2017 18:16:09 +0200
Raymond Wiker  wrote:

> Ahem A Rivet's Shot  writes:
>
> > On Sat, 08 Apr 2017 19:46:53 -0700
> > "DisneyWizard the Fantasmic!"  wrote:
> >
> >> [SOLVED] {dd if=/dev/sdb of=/dev/sda &} duplicates terabyte drives.
> >
> >  It will go much faster with bs=64k added to the arguments.
>
> Probably even faster with (a little higher) blocks... and using raw
> devices (/dev/rsd{a,b}) may also help.

 Not much faster with bigger blocks they tend to get split up to 64k
blocks between the driver and the hardware IME.

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