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The OS is not copied (written line by line with checks for errors as it goes to the final boot to the desktop).  There are no checks when the OS is imaged to a drive which is called a Ghost Dump, It is one large write with drivers integrated, not loaded afterward. You would be amazed at the amount of registry errors that are present when you check a new OEM machine just after it makes it to the desktop for the 1st time.  " I said i.e. the O.S. is copied IN full, not on full"   O.E.M.'s keep images for each machine type ready for drive installation when you purchase it from them or in a store. This is what the recovery section of the main drive is that they partition-in is, so you can go back to the original garbage dump.  The images are preactivated with Hardware Activation so you can reinstall the OS clean as long as it is the same version.