lazy old guy asks question

[mick.crane]

If I've got 3 200Gb disks that are working and one 1 Tb disk and want to 
be able to copy and replace the 3 disks.
Can I dd copy them to .isos on the 1 Tb disk then put them back on other 
disks so they boot?
Copy them to 3 partitions on the 1 Tb disk and dd an individual 
partition to another disk and have it boot?
mick