Third, if you copy this image to other drives (again, using dd), they must be as large or larger than the original disk, yet you won't be able to use any additional space you may have on the target disk until you resize your partitions. Second, dd provides absolutely no progress indications, which can be frustrating because the copy takes a long time. First, dd will copy your entire disk, even empty space, and if done on a large disk can result in an extremely large image file. There are a few drawbacks to using dd to clone disks. Once complete, image.img will be a byte-for-byte clone of the entire disk. Of course, make sure that you have proper permissions to read directly from /dev/hdb (I'd recommend running as root), and that /dev/hdb isn't mounted (you don't want to copy while the disk is being changed - mounting as read-only is also acceptable). To clone a disk, all you really need to do is specify the input and output to dd: dd if=/dev/hdb of=/image.img
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