I've just remembered, for a Raspberry Pi you don't need to duplicate the
entire contents of the µSD card - you can create a new partition table
and filesystems (FAT32 for boot, EXT4 for root) on the blank µSD card
and copy everything using regular file copy commands.
You might need to edit what will become /etc/fstab to update the UUID of
the new root filesystem. (And any other filesystems it needs to mount.)
The Raspberry Pi bootloader knows how to read a partition table and
FAT32 filesystem to load the kernel, so there's no magic hidden data on
the disk like with IBM PC-BIOS type booting.
The same goes for UEFI system bootloaders - they understand partition
tables and filesystems.
--
Andrew.
--
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