2007/10/8, Brian Litzinger <brian@worldcontrol.com>:

On Mon, Oct 08, 2007 at 11:17:40AM +0200, Beso wrote:
> does this work from hd to external usb disk?

dd will not work between disparate media.  It is even
risky between different (capacity, manufacturer) drives.

If by "this" you mean the latter stategy involving
sfdisk/rsync/grub the sfdisk step will mostly not work
between disparate media.

> 2007/10/7, Brian Litzinger < brian@worldcontrol.com>:
> >
> > On Sun, Oct 07, 2007 at 12:49:11AM -0400, Peter Davoust wrote:
> > > This may be a little noobish, and it may have been said, but can't you
> > > just install the new drive, partition it identically to the original
> > > drive and then...
> > >
> > > dd if=/dev/hda1 of=/dev/hdb1
> > > dd if=/dev/hda2 of=/dev/hdb2
> > >
> > > so on and so forth until you've got everything copied? Or event just
> > >
> > > dd if=/dev/hda of=/dev/hdb
> > >
> > > Wouldn't that work?
> >
> > The latter works fine in my experience.  I do it regularly.
> >
> > The downside, is that cloning a 750GB drive takes a while
> > as it duplicates everything including unused sectors.
> >
> > Things like clonezilla just copy the "used"/active sectors.
> >
> > A popular way is to use sfdisk.  I do not remember the exact
> > syntax, but a pair of sfdisk commands can transfer the partition
> > information directly between two drives.
> >
> > Then use rsync to move the data across.
> >
> > You may have to run grub setup on the new disk too.
> >
> > --
> > Brian Litzinger
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