I was trying to move /boot, / and swap to a smaller disk. Yes, a SMALLER disk. My private server is with a Fedora 6 system on a 80G disk, but it only occupies 2.78 GB. My data files are on other disks. So I decided to use a 40G disk to replace this 80G disk before I upgraded this server to Fedora 8. While I was writing this post, the server has been successfully upgraded, it is doing first time yum update.
Warning: Use this at your own risk.
You may only damage the new disk if you do something wrong, the old one should still work.
The old disk
Original system disk is on /dev/hda, the partitions look like
Disk /dev/hda: 82.3 GB, 82348277760 bytes
255 heads, 63 sectors/track, 10011 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hda1 * 1 13 104391 83 Linux
/dev/hda2 14 10011 80308935 8e Linux LVM
LLBB 