[CentOS] transfer data from one hard drive to another

The suggested knoppix dd solution should work well. You might want to
pass something like "bs=4096k" as additional argument to speed it up
considerably (bs is blocksize. Default is 512k)

However you might want to take a look at mondo rescue again. It does not
make a physical 1:1 copy of the harddisk, but it will recreate all
partitions, resized to occupy the entire space on the new drive and
install an mbr with your bootloader (lilo or grub that is). It's easy to
use too.

regards,
Andreas Micklei