Dear List, A question concerning data backups and transfer speed.. I am trying to do a backup using dd if=/dev/sda of=/dev/sdb From my internal hard disk to an external usb hard disk (i.e. I am just dumping the disk image to an empty disk). I am doing this, of course, while the filesystems are unmounted. I imagine that the bottleneck is the usb (2.0) connection. 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? 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..? Regards, Sampsa -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org