This article will tell you the definition of clone.
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Consequently the destination disk/partition possesses identical content as the original one.

A disc cloning program must have gear drivers or equivalent for all devices used.
This applies to tape drives, CD and DVD readers and writers, and USB and FireWire drives.
Cloning software contains its own TCP/IP stack for multicast transfer of data where required.
For more information, you could readClone Hard Drive with Best Disk Cloning Software.