On Fri, Oct 31, 2008 at 09:48:16AM +0100, Christoph Kukulies wrote:
> Hi list,
> I'm considering using a bootable USB stick with FreeBSD to perform a
> backup of my notebooks'
> 500 GB hard disk to a physically identical (same make, same type, same
> size) hard disk attached to USB.
> What would be the fastest way to do that sector by sector copy? I'm
> using dd right now,
> dd if=/dev/ad0 of=/dev/da0 bs=10000000
> but maybe there is a utility which does this faster or a larger buffer
> size? Probably the limit will be
> the USB 2.0 bus speed anyway?
In general, what you're doing is correct for a block copy. There is
nothing (that I know of) which is faster; you're copying 500GB of data
(including the unused portion -- you *did* ask for a block copy),
and this takes a long time. Be patient.
On the flip side, your blocksize (bs) there is quite high for no good
reason. I'd pick something more like bs=64k or bs=128k. The default
(512) is too small for what you want, but 10MBytes is silly.
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |
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