On 04/06/2020 04:10 PM, Glenn Edwards wrote:
Jon
The drive is 500Gb SATA and I can hook up several.
I 'man dd' on the old Ubuntu 8.04LTS and seems to be just a file copy
service. But I will try your suggestion when I boot off a LiveCD as this
makes sense not to disturb the Hot drive.
No, dd does not copy "files", it copies every block on the
partition or whole drive, block-for-block.
LILO or GRUB know the exact block location of the kernel and
kernel loader, so only a dd copy
will end up with those working immediately. Since the dd
copies all the unused blocks on the drive, it can be quite a
bit slower on a mostly empty disk. There are some
blocksize options that make it run faster.
If you create partitions and then do a cp of the old file
systems to the new disk, the kernel and loader
will be in different block locations, and LILO or GRUB will
not be able to boot the OS. There is a
way to fix this by booting from the live CD, but it is
getting into guru territory.
But, if you copy to a smaller disk, or want to change the
partition sizes, then that is what you have to do.
Jon
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