Does Win XP not incorporate details of the hard disk in its setup to prevent people cloning?
It's not "just" the hard drive that WinXP looks at. There is a security code/key that is generated based on many components in your system - motherboard's BIOS, network card, video card, hard drive's serial number, etc. When too many of these components change at the same time, Windows Product Activation (WPA) steps in and asks you to call Microsoft for reactivation. The exception to this rule is when you have a brand-name PC made by such companies as HP or Dell. The OEM version of Windows only relies on the BIOS for activation. So as long as you don't upgrade the motherboard, you have nothing to worry about there.
But to answer your question, changing
just the hard drive is not enough to cause any problems in Windows XP.
There are two files under C:\Windows\System32 that you can back up in case your hard drive crashes and you don't have any backups or a working image. The files are
Wpa.dbl and
Wpa.bak. When you are stuck in an activation prompt after reinstalling of Windows, you should be able to boot into Safe Mode and copy these two files back into the System32 folder to restore the activation. Of course, this only works again if the hardware hasn't changed drastically.
This site explains all that in detail and a lot more:
~cdogg
"
Insanity: doing the same thing over and over again and expecting different results." - Albert Einstein
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