Sampsa Riikonen wrote:
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?
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