I have a Sparc 2 with Solaris 2.5 and 2 4gb drives. I need to replace a 4gb drive with a 9gb drive. Assuming the old and the new drives are online, what is the best method for copying the data from drive to drive? I heard about "dd", but not sure about the parameters. How can I tell what by blocksizes are on the drives? What about "cp -r" or "tar".