Cloning a disk — copying an entire drive onto a new one — is the easy way to move to a bigger or faster drive without reinstalling everything. It is worth knowing what cloning does to your hardware identifiers, because it behaves the opposite way to a fresh install.
Cloning copies everything, identifiers included
A clone is a faithful copy of the source drive. That is the point: every file, every setting, the whole operating system, exactly as it was. But "everything" includes the parts that act as identifiers. The volume serial number written into the partition is copied along with it. The Windows Registry, which lives on the disk, is copied — and with it the machine GUID and other registry-based identifiers.
Why this is the opposite of a fresh install
This is the key contrast. A fresh Windows install generates new identifiers — a new machine GUID, freshly assigned volume serials. Cloning does the reverse: it preserves the old ones. After cloning, your new drive presents the same volume serial and the same machine GUID as the original. To anything reading those identifiers, the cloned system looks like the same system — which is usually exactly what you want when migrating, and worth knowing if you assumed a new drive means new identifiers.
What cloning does not affect
Cloning is about the disk, so it only moves what is on the disk. Identifiers that do not live on the disk are untouched by it. The motherboard's firmware identifiers — the SMBIOS UUID, the BIOS serial — are in firmware, not on any drive, so cloning neither copies nor changes them. MAC addresses belong to the network adapters. And the new physical drive has its own built-in firmware serial, which is a property of the hardware, not something a clone overwrites.
The takeaway
Disk cloning copies a drive faithfully, and that includes the identifiers stored on it — the volume serial and the registry's machine GUID come along unchanged. That is the opposite of a fresh install, which generates new ones. Cloning does not touch firmware identifiers or MAC addresses, because those were never on the disk. If you clone a drive, expect the system's software-level identity to carry over intact.