I noticed that no matter which microSD card I burn the Raspbian image onto, its "identifier" is always
7ee80803. This appears counter-intuitive to be because "disk identifier" is something written in the hardware and is not supposed to be writable. Even if the volume ID of a partition is customizable during formatting or creation of the volume, the option
PARTUUID=7ee80803-02 reads like "2nd partition of disk
7ee80803", which indicates that
7ee80803 isn't the identifier of a partition, but the disk.
Why is that?