Lets say I have
Before, I run
dd if=/dev/sda of=/dev/sdb bs=128M, and it succeeded.
Then after some time, there is update on first disk, and I want to clone it to second disk. But I don't want to run
dd from beginning, because ... well it takes time.
Any solution to update on the
/dev/sdb without dd'ing from start?
UPDATE : the disk actually is ntfs, so rsync is not a solution. Also, I want the second disk to be bootable like the source disk, using rsync would break so many things.